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|-------------------------------------------------------------------------------|
|                                                                               |  |  |  |  |  |  |
|                                                                          |   | Digi International Reports Third Fiscal Quarter 2015 Results |   |   |
| Refocused Business and Discipline Drives Record Revenue and Improved Earnings |

|                                               |
|-----------------------------------------------|
|                                               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| GAAP Results                                  |
| (in thousands, except per share data)         |   | Q3 2015 |   | Q3 2014 |   | YTD 2015 |   | YTD 2014 |
| Total Revenue                                 |   | $ | 54,538 |  |   | $ | 47,885 |  |   | $ | 156,412 |  |   | $ | 141,089 |  |
| Gross Profit                                  |   | $ | 25,349 |  |   | $ | 22,149 |  |   | $ | 71,349 |  |   | $ | 66,837 |  |
| Gross Margin                                  |   | 46.5 | % |   | 46.3 |  % |   | 45.6 | % |   | 47.4 |  % |
| Operating Income (Loss)                       |   | $ | 2,830 |  |   | $ | (280 | ) |   | $ | 2,152 |  |   | $ | (301 | ) |
| Operating Income (Loss) as % of Total Revenue |   | 5.2 | % |   | (0.5 | )% |   | 1.4 | % |   | (0.2 | )% |
| Net Income (Loss)                             |   | $ | 2,496 |  |   | $ | (101 | ) |   | $ | 3,603 |  |   | $ | 1,325 |  |
| Net Income per Diluted Share                  |   | $ | 0.10 |  |   | $ | — |  |   | $ | 0.14 |  |   | $ | 0.05 |  |

|                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------|
|                                                                                                                   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Non-GAAP Results*                                                                                                 |
| (in thousands, except per share data)                                                                             |   | Q3 2015 |   | Q3 2014 |   | YTD 2015 |   | YTD 2014 |
| Adjusted Net Income (Loss)                                                                                        |   | $ | 2,134 |  |   | $ | (362 | ) |   | $ | 2,448 |  |   | $ | (203 | ) |
| Adjusted Net Income (Loss) per Diluted Share                                                                      |   | $ | 0.08 |  |   | $ | (0.01 | ) |   | $ | 0.10 |  |   | $ | (0.01 | ) |
|                                                                                                              |   |   |   |   |   |   |   |   |
| Adjusted EBITDA                                                                                                   |   | $ | 4,337 |  |   | $ | 1,413 |  |   | $ | 7,364 |  |   | $ | 5,225 |  |
| Adjusted EBITDA as % of Total Revenue                                                                             |   | 8.0 | % |   | 3.0 | % |   | 4.7 | % |   | 3.7 | % |
| * A table with a detailed reconciliation to non-GAAP information is provided at the end of this earnings release. |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|                                        |
|----------------------------------------|
|                                        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Revenue Detail QTD                     |
| (in thousands)                         |   | Q3 2015 |   | Q3 2014 |   | Change |   | % Change |
| Growth hardware                        |   | $ | 27,590 |  |   | $ | 21,751 |  |   | $ | 5,839 |  |   | 26.8 |  |
| Mature hardware                        |   | 22,411 |  |   | 21,552 |  |   | 859 |  |   | 4.0 |  |
| Total product revenue                  |   | 50,001 |  |   | 43,303 |  |   | 6,698 |  |   | 15.5 |  |
| Service                                |   | 4,537 |  |   | 4,582 |  |   | (45 | ) |   | (1.0 | ) |
| Total revenue                          |   | $ | 54,538 |  |   | $ | 47,885 |  |   | $ | 6,653 |  |   | 13.9 |  |
|                                   |   |   |   |   |   |   |   |   |
| North America, primarily United States |   | $ | 34,610 |  |   | $ | 27,988 |  |   | $ | 6,622 |  |   | 23.7 |  |
| Europe, Middle East and Africa         |   | 12,985 |  |   | 11,833 |  |   | 1,152 |  |   | 9.7 |  |
| Asia                                   |   | 6,091 |  |   | 6,679 |  |   | (588 | ) |   | (8.8 | ) |
| Latin America                          |   | 852 |  |   | 1,385 |  |   | (533 | ) |   | (38.5 | ) |
| Total revenue                          |   | $ | 54,538 |  |   | $ | 47,885 |  |   | $ | 6,653 |  |   | 13.9 |  |

|         |                                                                                                                                                                                                                          |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Product revenue increased by $6.7 million, or 15.5%, in the third fiscal quarter of 2015 compared to the prior year's comparable quarter, driven primarily by cellular router and gateway products and embedded modules. |

|         |                                                                                                                                   |
|---------|-----------------------------------------------------------------------------------------------------------------------------------|
| • | Service revenue decreased approximately 1.0% in the third fiscal quarter of 2015 compared to the prior year's comparable quarter. |

|         |                                                                                                                                                                                                                                 |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Revenue growth in the quarter was partially offset by a weakening of the Euro and British Pound, as the impact of this foreign currency translation was $1.1 million when compared to the same period in the prior fiscal year. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Hardware product gross margin was 48.5% in the third fiscal quarter of 2015 compared to 50.1% in the same quarter in the prior year.  Generally our growth products have a lower gross margin than mature products.  Since the mix of our hardware products is becoming increasingly weighted toward growth products, our gross margin has decreased relative to the third quarter of 2014.  Growth hardware products were 55.2% of total product revenue in the third fiscal quarter of 2015 compared to 50.2% of total product revenue in the comparable year ago quarter.  Strong sales of mature hardware products in the third fiscal quarter of 2015 mitigated the decrease in gross margin compared to the year ago quarter. |

|         |                                                                                                                                                                                                                                                                                             |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Service gross margin for the third fiscal quarter of 2015 was 23.7% compared to 9.5% in the same quarter in the prior year.  This is a direct result of improved utilization of consulting labor in connection with the restructuring that took place in the second fiscal quarter of 2015. |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|         |                                                                                                                                                                                               |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Net income in the third fiscal quarter of 2015 included a gain from an insurance recovery of $0.3 million, net of tax, or $0.01 per diluted share, and discrete tax benefits of $0.1 million. |

|         |                                                                                                                                                                                                                                                                         |
|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Net loss in the third fiscal quarter of 2014 included a discrete tax benefit of $0.3 million, or $0.01 per diluted share, resulting from the reassessment of certain state research and development tax credits and our ability to realize these credits in the future. |

|                                        |
|----------------------------------------|
|                                        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Revenue Detail YTD                     |
| (in thousands)                         |   | Q3 2015 |   | Q3 2014 |   | Change |   | % Change |
| Growth hardware                        |   | $ | 83,816 |  |   | $ | 64,369 |  |   | $ | 19,447 |  |   | 30.2 |  |
| Mature hardware                        |   | 59,226 |  |   | 61,483 |  |   | (2,257 | ) |   | (3.7 | ) |
| Total product revenue                  |   | 143,042 |  |   | 125,852 |  |   | 17,190 |  |   | 13.7 |  |
| Service                                |   | 13,370 |  |   | 15,237 |  |   | (1,867 | ) |   | (12.3 | ) |
| Total revenue                          |   | $ | 156,412 |  |   | $ | 141,089 |  |   | $ | 15,323 |  |   | 10.9 |  |
|                                   |   |   |   |   |   |   |   |   |
| North America, primarily United States |   | $ | 97,711 |  |   | $ | 84,777 |  |   | $ | 12,934 |  |   | 15.3 |  |
| Europe, Middle East and Africa         |   | 36,599 |  |   | 35,373 |  |   | 1,226 |  |   | 3.5 |  |
| Asia                                   |   | 17,208 |  |   | 16,748 |  |   | 460 |  |   | 2.7 |  |
| Latin America                          |   | 4,894 |  |   | 4,191 |  |   | 703 |  |   | 16.8 |  |
| Total revenue                          |   | $ | 156,412 |  |   | $ | 141,089 |  |   | $ | 15,323 |  |   | 10.9 |  |

|         |                                                                                                                                                                                                                        |
|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Product revenue increased by $17.2 million, or 13.7%, in the first nine months of fiscal 2015 compared to the prior year's comparable period, driven primarily by cellular router and gateway products and RF modules. |

|         |                                                                                                                                                                                        |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Service revenue decreased by $1.9 million, or 12.3%, in the first nine months of fiscal 2015 compared to the prior year's comparable period as a result of completing fewer contracts. |

|         |                                                                                                                                                                                                                                                |
|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Total revenue in the first nine months of 2015 was partially offset by a weakening of the Euro and British Pound.  The impact of this foreign currency translation was $2.6 million when compared to the same period in the prior fiscal year. |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|         |                                                                                                                                                                                                                                                                                                                                                                                               |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Our cash and cash equivalents and marketable securities balance, including long-term marketable securities, was $100.8 million at June 30, 2015, an increase of $8.8 million over the comparable balance at September 30, 2014 and an increase of $8.3 million over the balance at March 31, 2015.  Please refer to the Condensed Consolidated Statements of Cash Flows for more information. |

|         |                                                          |
|---------|----------------------------------------------------------|
| • | We had no debt on the balance sheet as of June 30, 2015. |

|         |                                                                                              |
|---------|----------------------------------------------------------------------------------------------|
| • | At June 30, 2015, our current ratio was 7.5 to 1 compared to 6.8 to 1 at September 30, 2014. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Furuno Electric Co. Ltd. (Tokyo: 6814), a leading provider of marine communications and navigation equipment, has selected Digi’s components and design services for its recently announced NavNet TZtouch2 advanced marine navigation systems.  Furuno will use Digi’s ConnectCore® 6, the world’s first surface-mount multi-chip module with built-in wireless connectivity, for its Next-Generation Marine Navigation Systems. |

|         |                                                                                                                                                                                                                                                              |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | A leading concessionaire of self-serve vended luggage carts, electronic lockers, commercial strollers and massage chairs, has selected the Digi TransPort® WR11 for 4G LTE connectivity at major US airports after extensive lab and field testing. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | TurboChef Technologies, Inc. pioneers the world of rapid cooking by designing rapid-cook ovens that are versatile, user-friendly, and save energy. TurboChef will now use Digi’s XBee® WiFi and Digi Device Cloud to monitor and remotely manage ovens for leading franchise convenience stores and quick serve restaurants. With XBee and Device Cloud, TurboChef can remotely monitor fault codes to maximize equipment up time. This connectivity also enables TurboChef to remotely update firmware and end customer menu items. In the past, customers, such as franchises with more than 2,000 ovens installed, had to send memory modules to all locations for each menu update. |

|         |                                                                                                                                                                                                                                                                          |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | An independent state agency that designs and constructs bridges and highways and provides varied mass transit services has selected the Digi TransPort® WR44 as the router that will be used in an upgrade of the CAD/AVL system in more than 150 of its buses. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Grupo Unión is a solution provider in the engineering and distribution services industry with 30 years of experience in electricity, telecommunications, defense, security and automation.  Headquartered in Colombia, Grupo Unión also has locations in Chile, Ecuador, Peru, Panamá and Mexico. Grupo Unión has optimized telecommunications networks for remote measurement systems in Colombia using Digi’s XBee-PRO® 900HP.  With an installation of more than 7,000 XBee modules, Grupo Unión has solved key issues in Colombia like loss of energy, demand management, energy efficiency and smart grid optimization. |

|         |                                                                                                                                                                                                                                                     |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | An organization that manufactures utility grade, revenue class submeters for commercial, industrial, and residential markets selected the Digi XBee® 900HP to extend the range of its commercial and residential electric metering system. |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|         |                                                                                                                                                                                                                                                          |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | A domestic energy delivery company that serves more than five million metered customers has selected the Digi TransPort® WR44 as part of their Intelligent Grid Solution.  The WR44 will also enable the solution to migrate from 3G to 4G LTE. |

|         |                                                                                                                                                                                         |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | A leading transportation and shipping provider selected Digi’s USB-Async Edgeport products to enable scanning and tracking technology for packages in their logistics facilities. |

|                                                                                 |
|---------------------------------------------------------------------------------|
|                                                                                 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                                            | Three months ended June 30, |   | Nine months ended June 30, |
|                                                                            | 2015 |   | 2014 |   | 2015 |   | 2014 |
| Net income (loss) and net income per common share, diluted                      | $ | 2,496 |  |   | $ | 0.10 |  |   | $ | (101 | ) |   | $ | — |  |   | $ | 3,603 |  |   | $ | 0.14 |  |   | $ | 1,325 |  |   | $ | 0.05 |  |
| Restructuring reserve, net of taxes                                             | (6 | ) |   | NM |  |   | — |  |   | — |  |   | 331 |  |   | 0.01 |  |   | 53 |  |   | NM |  |
| Gain from insurance recovery, net of taxes                                      | (251 | ) |   | (0.01 | ) |   | — |  |   | — |  |   | (894 | ) |   | (0.04 | ) |   | — |  |   | — |  |
| Discrete tax benefits (1)                                                       | (105 | ) |   | NM |  |   | (261 | ) |   | (0.01 | ) |   | (592 | ) |   | (0.02 | ) |   | (1,581 | ) |   | (0.06 | ) |
| Adjusted net income (loss) and adjusted net income (loss) per diluted share (2) | $ | 2,134 |  |   | $ | 0.08 |  |   | $ | (362 | ) |   | $ | (0.01 | ) |   | $ | 2,448 |  |   | $ | 0.10 |  |   | $ | (203 | ) |   | $ | (0.01 | ) |
| Diluted weighted average common shares (3)                                      |   |   | 25,710 |  |   |   |   | 25,274 |  |   |   |   | 25,085 |  |   |   |   | 25,965 |  |

|     |                                                                                                                                                                                                                                                                                                            |
|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (1) | Discrete tax benefits include extended research and development tax credits and expiration of statute of limitations in various tax jurisdictions, re-measurement and reversal of certain tax reserves as a result of a federal income tax audit, and adjustment of state rate on net deferred tax assets. |

|     |                                                                                                                         |
|-----|-------------------------------------------------------------------------------------------------------------------------|
| (2) | Earnings per share presented are calculated by line item and certain amounts may not add due to use of rounded numbers. |

|     |                                                                                                                                                                                   |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (3) | For the three and nine months ended June 30, 2014, diluted weighted average common shares were the same as basic common shares as there were net losses in both of those periods. |

|                                |
|--------------------------------|
|                                |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                           | Three months ended June 30, |   | Nine months ended June 30, |
|                           | 2015 |   | 2014 |   | 2015 |   | 2014 |
|                           |   |   | % of totalrevenue |   |   |   | % of totalrevenue |   |   |   | % of totalrevenue |   |   |   | % of totalrevenue |
| Total revenue                  | $ | 54,538 |  |   | 100.0 | % |   | $ | 47,885 |  |   | 100.0 | % |   | $ | 156,412 |  |   | 100.0 | % |   | $ | 141,089 |  |   | 100.0 | % |
|                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net income (loss)              | $ | 2,496 |  |   |   |   | $ | (101 | ) |   |   |   | $ | 3,603 |  |   |   |   | $ | 1,325 |  |   |   |
| Gain from insurance recovery   | (386 | ) |   |   |   | — |  |   |   |   | (1,375 | ) |   |   |   | — |  |   |   |
| Interest income, net           | (42 | ) |   |   |   | (35 | ) |   |   |   | (134 | ) |   |   |   | (127 | ) |   |   |
| Income tax provision (benefit) | 795 |  |   |   |   | (213 | ) |   |   |   | 814 |  |   |   |   | (1,454 | ) |   |   |
| Depreciation and amortization  | 1,474 |  |   |   |   | 1,762 |  |   |   |   | 4,456 |  |   |   |   | 5,481 |  |   |   |
| Adjusted EBITDA                | $ | 4,337 |  |   | 8.0 | % |   | $ | 1,413 |  |   | 3.0 | % |   | $ | 7,364 |  |   | 4.7 | % |   | $ | 5,225 |  |   | 3.7 | % |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |
| Mike Goergen                                                 |   |   |
| Senior Vice President, Chief Financial Officer and Treasurer |   |   |
| Digi International                                           |   |   |
| 952-912-3737                                                 |   |   |
| Email:  mike.goergen@digi.com                                |   |   |
|                                                         |   |   |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|                                   |
|-----------------------------------|
|                                   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                              | Three months endedJune 30, |   | Nine months endedJune 30, |
|                              | 2015 |   | 2014 |   | 2015 |   | 2014 |
| Revenue:                          |   |   |   |   |   |   |   |
| Hardware product                  | $ | 50,001 |  |   | $ | 43,303 |  |   | $ | 143,042 |  |   | $ | 125,852 |  |
| Service                           | 4,537 |  |   | 4,582 |  |   | 13,370 |  |   | 15,237 |  |
| Total revenue                     | 54,538 |  |   | 47,885 |  |   | 156,412 |  |   | 141,089 |  |
| Cost of sales:                    |   |   |   |   |   |   |   |
| Cost of hardware product          | 25,729 |  |   | 21,587 |  |   | 74,339 |  |   | 61,862 |  |
| Cost of service                   | 3,460 |  |   | 4,149 |  |   | 10,724 |  |   | 12,390 |  |
| Total cost of sales               | 29,189 |  |   | 25,736 |  |   | 85,063 |  |   | 74,252 |  |
| Gross profit                      | 25,349 |  |   | 22,149 |  |   | 71,349 |  |   | 66,837 |  |
| Operating expenses:               |   |   |   |   |   |   |   |
| Sales and marketing               | 9,434 |  |   | 9,859 |  |   | 30,525 |  |   | 30,477 |  |
| Research and development          | 8,374 |  |   | 7,253 |  |   | 23,715 |  |   | 21,921 |  |
| General and administrative        | 4,720 |  |   | 5,317 |  |   | 14,448 |  |   | 14,659 |  |
| Restructuring charges, net        | (9 | ) |   | — |  |   | 509 |  |   | 81 |  |
| Total operating expenses          | 22,519 |  |   | 22,429 |  |   | 69,197 |  |   | 67,138 |  |
| Operating income (loss)           | 2,830 |  |   | (280 | ) |   | 2,152 |  |   | (301 | ) |
| Other income (loss), net:         |   |   |   |   |   |   |   |
| Interest income, net              | 42 |  |   | 35 |  |   | 134 |  |   | 127 |  |
| Other income (loss), net          | 419 |  |   | (69 | ) |   | 2,131 |  |   | 45 |  |
| Total other income (loss), net    | 461 |  |   | (34 | ) |   | 2,265 |  |   | 172 |  |
| Income (loss) before income taxes | 3,291 |  |   | (314 | ) |   | 4,417 |  |   | (129 | ) |
| Income tax provision (benefit)    | 795 |  |   | (213 | ) |   | 814 |  |   | (1,454 | ) |
| Net income (loss)                 | $ | 2,496 |  |   | $ | (101 | ) |   | $ | 3,603 |  |   | $ | 1,325 |  |
| Net income per common share:      |   |   |   |   |   |   |   |
| Basic                             | $ | 0.10 |  |   | $ | — |  |   | $ | 0.15 |  |   | $ | 0.05 |  |
| Diluted                           | $ | 0.10 |  |   | $ | — |  |   | $ | 0.14 |  |   | $ | 0.05 |  |
| Weighted average common shares:   |   |   |   |   |   |   |   |
| Basic                             | 24,938 |  |   | 25,274 |  |   | 24,525 |  |   | 25,545 |  |
| Diluted                           | 25,710 |  |   | 25,274 |  |   | 25,085 |  |   | 25,965 |  |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|                                                                                        |
|----------------------------------------------------------------------------------------|
|                                                                                        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                                                   | Three months endedJune 30, |   | Nine months endedJune 30, |
|                                                                                   | 2015 |   | 2014 |   | 2015 |   | 2014 |
| Net income (loss)                                                                      | $ | 2,496 |  |   | $ | (101 | ) |   | $ | 3,603 |  |   | $ | 1,325 |  |
| Other comprehensive income (loss), net of tax:                                         |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                | 1,571 |  |   | 384 |  |   | (4,158 | ) |   | 546 |  |
| Change in net unrealized gain (loss) on investments                                    | 4 |  |   | (2 | ) |   | (2 | ) |   | 62 |  |
| Less income tax (provision) benefit                                                    | (1 | ) |   | 1 |  |   | 1 |  |   | (24 | ) |
| Reclassification of realized loss on investments included  in net income (1) | — |  |   | — |  |   | 1 |  |   | — |  |
| Other comprehensive income (loss), net of tax                                          | 1,574 |  |   | 383 |  |   | (4,158 | ) |   | 584 |  |
| Comprehensive income (loss)                                                            | $ | 4,070 |  |   | $ | 282 |  |   | $ | (555 | ) |   | $ | 1,909 |  |

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|                                                              |
|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|                                                  |
|--------------------------------------------------|
|                                                  |  |  |  |  |  |  |  |
|                                             |   |   |   |
|                                             | June 30,                                        2015 |   | September 30, 2014 |
| ASSETS                                           |   |   |   |
| Current assets:                                  |   |   |   |
| Cash and cash equivalents                        | $ | 53,755 |  |   | $ | 47,490 |  |
| Marketable securities                            | 37,527 |  |   | 32,898 |  |
| Accounts receivable, net                         | 24,415 |  |   | 28,576 |  |
| Inventories                                      | 34,690 |  |   | 31,247 |  |
| Deferred tax assets                              | 3,072 |  |   | 3,221 |  |
| Other                                            | 2,912 |  |   | 4,249 |  |
| Total current assets                             | 156,371 |  |   | 147,681 |  |
| Marketable securities, long-term                 | 9,471 |  |   | 11,541 |  |
| Property, equipment and improvements, net        | 14,628 |  |   | 13,231 |  |
| Identifiable intangible assets, net              | 4,789 |  |   | 6,785 |  |
| Goodwill                                         | 102,497 |  |   | 103,398 |  |
| Deferred tax assets                              | 5,708 |  |   | 7,383 |  |
| Other                                            | 293 |  |   | 440 |  |
| Total assets                                     | $ | 293,757 |  |   | $ | 290,459 |  |
| LIABILITIES AND STOCKHOLDERS’ EQUITY       |   |   |   |
| Current liabilities:                             |   |   |   |
| Accounts payable                                 | $ | 7,048 |  |   | $ | 10,451 |  |
| Accrued compensation                             | 10,464 |  |   | 8,133 |  |
| Other                                            | 3,372 |  |   | 3,170 |  |
| Total current liabilities                        | 20,884 |  |   | 21,754 |  |
| Income taxes payable                             | 1,401 |  |   | 2,724 |  |
| Deferred tax liabilities                         | 151 |  |   | 272 |  |
| Other noncurrent liabilities                     | 678 |  |   | 411 |  |
| Total liabilities                                | 23,114 |  |   | 25,161 |  |
|                                             |   |   |   |
| Total stockholders’ equity                 | 270,643 |  |   | 265,298 |  |
| Total liabilities and stockholders’ equity | $ | 293,757 |  |   | $ | 290,459 |  |

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|--------------------------------------------------------------|
|                                                              |  |  |  |  |
|                                                         |   |   |   |   |
| Digi International Reports Third Fiscal Quarter 2015 Results |

|                                                                                                                |
|----------------------------------------------------------------------------------------------------------------|
|                                                                                                                |  |  |  |  |  |  |  |
|                                                                                                           | Nine months ended June 30, |
|                                                                                                           | 2015 |   | 2014 |
| Operating activities:                                                                                          |   |   |   |
| Net income                                                                                                     | $ | 3,603 |  |   | $ | 1,325 |  |
| Adjustments to reconcile net income to net cash provided by operating activities:                              |   |   |   |
| Depreciation of property, equipment and improvements                                                           | 2,170 |  |   | 2,694 |  |
| Amortization of identifiable intangible assets                                                                 | 2,286 |  |   | 2,787 |  |
| Stock-based compensation                                                                                       | 3,262 |  |   | 3,160 |  |
| Excess tax benefits from stock-based compensation                                                              | — |  |   | (44 | ) |
| Deferred income tax provision (benefit)                                                                        | 1,729 |  |   | (2,033 | ) |
| Gain on insurance settlement related to property and equipment                                                 | (1,375 | ) |   | — |  |
| Bad debt/product return provision                                                                              | 198 |  |   | (196 | ) |
| Inventory obsolescence                                                                                         | 842 |  |   | 610 |  |
| Restructuring charges, net                                                                                     | 509 |  |   | 81 |  |
| Other                                                                                                          | (81 | ) |   | (24 | ) |
| Changes in operating assets and liabilities                                                                    | (4,147 | ) |   | (5,815 | ) |
| Net cash provided by operating activities                                                                      | 8,996 |  |   | 2,545 |  |
| Investing activities:                                                                                          |   |   |   |
| Purchase of marketable securities                                                                              | (31,054 | ) |   | (15,574 | ) |
| Proceeds from maturities of marketable securities                                                              | 28,494 |  |   | 35,364 |  |
| Proceeds from insurance settlement related to property and equipment                                           | 1,400 |  |   | — |  |
| Proceeds from sale of property and equipment                                                                   | 45 |  |   | — |  |
| Purchase of property, equipment, improvements and certain     other intangible assets | (3,888 | ) |   | (2,719 | ) |
| Net cash (used in) provided by investing activities                                                            | (5,003 | ) |   | 17,071 |  |
| Financing activities:                                                                                          |   |   |   |
| Excess tax benefits from stock-based compensation                                                              | — |  |   | 44 |  |
| Proceeds from stock option plan transactions                                                                   | 6,332 |  |   | 3,336 |  |
| Proceeds from employee stock purchase plan transactions                                                        | 708 |  |   | 770 |  |
| Purchases of common stock                                                                                      | (2,339 | ) |   | (9,651 | ) |
| Net cash provided by (used in) financing activities                                                            | 4,701 |  |   | (5,501 | ) |
| Effect of exchange rate changes on cash and cash equivalents                                                   | (2,429 | ) |   | 482 |  |
| Net increase in cash and cash equivalents                                                                      | 6,265 |  |   | 14,597 |  |
| Cash and cash equivalents, beginning of period                                                                 | 47,490 |  |   | 41,320 |  |
| Cash and cash equivalents, end of period                                                                       | $ | 53,755 |  |   | $ | 55,917 |  |