|        |
|--------|
|        |  |  |
|   |   |   |
|   |

|                                                                                           |
|-------------------------------------------------------------------------------------------|
|                                                                                           |  |  |  |  |  |  |
|                                                                                      |   | Digi International Reports Second Fiscal Quarter 2015 Results |   |   |
| Revenue for Second Fiscal Quarter 2015 Increased by 15.8% from Same Period in Fiscal 2014 |
| Operating Income Improves Sequentially from First Fiscal Quarter 2015                     |

|                                               |
|-----------------------------------------------|
|                                               |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| GAAP Results                                  |
| (in thousands, except per share data)         |   | Q2 2015 |   | Q2 2014 |   | YTD 2015 |   | YTD 2014 |
| Total Revenue                                 |   | $ | 53,151 |  |   | $ | 45,882 |  |   | $ | 101,874 |  |   | $ | 93,204 |  |
| Gross Profit                                  |   | $ | 24,078 |  |   | $ | 21,780 |  |   | $ | 46,000 |  |   | $ | 44,688 |  |
| Gross Margin                                  |   | 45.3 | % |   | 47.5 |  % |   | 45.2 |  % |   | 47.9 |  % |
| Operating Income (Loss)                       |   | $ | 942 |  |   | $ | (649 | ) |   | $ | (678 | ) |   | $ | (21 | ) |
| Operating Income (Loss) as % of Total Revenue |   | 1.8 | % |   | (1.4 | )% |   | (0.7 | )% |   | — |  % |
| Net Income                                    |   | $ | 1,446 |  |   | $ | 738 |  |   | $ | 1,107 |  |   | $ | 1,426 |  |
| Net Income per Diluted Share                  |   | $ | 0.06 |  |   | $ | 0.03 |  |   | $ | 0.04 |  |   | $ | 0.05 |  |

|                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------|
|                                                                                                                   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Non-GAAP Results*                                                                                                 |
| (in thousands, except per share data)                                                                             |   | Q2 2015 |   | Q2 2014 |   | YTD 2015 |   | YTD 2014 |
| Net Income (Loss)                                                                                                 |   | $ | 1,125 |  |   | $ | (367 | ) |   | $ | 298 |  |   | $ | 159 |  |
| Net Income (Loss) per Diluted Share                                                                               |   | $ | 0.04 |  |   | $ | (0.01 | ) |   | $ | 0.01 |  |   | $ | 0.01 |  |
|                                                                                                              |   |   |   |   |   |   |   |   |
| Adjusted EBITDA                                                                                                   |   | $ | 2,712 |  |   | $ | 1,242 |  |   | $ | 3,002 |  |   | $ | 3,812 |  |
| Adjusted EBITDA as % of Total Revenue                                                                             |   | 5.1 | % |   | 2.7 | % |   | 2.9 | % |   | 4.1 | % |
| * A table with a detailed reconciliation to non-GAAP information is provided at the end of this earnings release. |

----

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

|                                        |
|----------------------------------------|
|                                        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Revenue Detail QTD                     |
| (in thousands)                         |   | Q2 2015 |   | Q2 2014 |   | Change |   | % Change |
| Growth hardware                        |   | $ | 30,376 |  |   | $ | 20,815 |  |   | $ | 9,561 |  |   | 45.9 |  |
| Mature hardware                        |   | 17,732 |  |   | 19,745 |  |   | (2,013 | ) |   | (10.2 | ) |
| Total product revenue                  |   | 48,108 |  |   | 40,560 |  |   | 7,548 |  |   | 18.6 |  |
| Service                                |   | 5,043 |  |   | 5,322 |  |   | (279 | ) |   | (5.2 | ) |
| Total revenue                          |   | $ | 53,151 |  |   | $ | 45,882 |  |   | $ | 7,269 |  |   | 15.8 |  |
|                                   |   |   |   |   |   |   |   |   |
| North America, primarily United States |   | $ | 32,388 |  |   | $ | 27,352 |  |   | $ | 5,036 |  |   | 18.4 |  |
| Europe, Middle East and Africa         |   | 12,383 |  |   | 11,943 |  |   | 440 |  |   | 3.7 |  |
| Asia                                   |   | 5,714 |  |   | 4,996 |  |   | 718 |  |   | 14.4 |  |
| Latin America                          |   | 2,666 |  |   | 1,591 |  |   | 1,075 |  |   | 67.6 |  |
| Total revenue                          |   | $ | 53,151 |  |   | $ | 45,882 |  |   | $ | 7,269 |  |   | 15.8 |  |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Product revenue increased by $7.6 million, or 18.6%, in the second fiscal quarter of 2015 compared to the prior year's comparable quarter, driven primarily by cellular router and gateway products and RF modules.  We estimate that approximately $1.5 million of revenue recorded in the second fiscal quarter of 2015 was a result of orders that were delayed from the first fiscal quarter of 2015 that could not be fulfilled due to the impact of the fire at our subcontract manufacturing location. |

|         |                                                                                                                                           |
|---------|-------------------------------------------------------------------------------------------------------------------------------------------|
| • | Service revenue decreased by $0.3 million, or 5.2%, in the second fiscal quarter of 2015 compared to the prior year's comparable quarter. |

|         |                                                                                                                                                                                                                                                   |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Total revenue in the second fiscal quarter of 2015 was unfavorably impacted by foreign currency translation of $1.1 million when compared to the same period in the prior fiscal year as a result of the weakening of the Euro and British Pound. |

|         |                                                                                                                                                                                                                                                                                                                                       |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Hardware product gross margin was 47.0% in the second fiscal quarter of 2015 compared to 50.7% in the same quarter in the prior year.  Gross margin was negatively impacted by product mix, as revenue from mature hardware products was replaced with revenue from growth hardware products that generally have lower gross margins. |

|         |                                                                                                                                                                                                                             |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Service gross margin for the second fiscal quarter of 2015 was 29.1% compared to 23.1% in the same quarter in the prior year, resulting from improved utilization of consulting labor in connection with the restructuring. |

----

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

|         |                                                                                                                                                |
|---------|------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Net income in the second fiscal quarter of 2015 was reduced by a restructuring charge of $0.3 million, net of tax, or $0.01 per diluted share. |

|         |                                                                                                                                      |
|---------|--------------------------------------------------------------------------------------------------------------------------------------|
| • | Net income in the second fiscal quarter of 2015 included insurance proceeds of $0.7 million, net of tax, or $0.03 per diluted share. |

|         |                                                                                                                                                                                                                                                                      |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Net income in the second fiscal quarter of 2014 included a discrete tax benefit of $1.1 million, or $0.04 per diluted share, resulting from the remeasurement and reversal of certain tax reserves in conjunction with the settlement of a federal income tax audit. |

|                                        |
|----------------------------------------|
|                                        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Revenue Detail YTD                     |
| (in thousands)                         |   | Q2 2015 |   | Q2 2014 |   | Change |   | % Change |
| Growth hardware                        |   | $ | 56,226 |  |   | $ | 42,618 |  |   | $ | 13,608 |  |   | 31.9 |  |
| Mature hardware                        |   | 36,815 |  |   | 39,931 |  |   | (3,116 | ) |   | (7.8 | ) |
| Total product revenue                  |   | 93,041 |  |   | 82,549 |  |   | 10,492 |  |   | 12.7 |  |
| Service                                |   | 8,833 |  |   | 10,655 |  |   | (1,822 | ) |   | (17.1 | ) |
| Total revenue                          |   | $ | 101,874 |  |   | $ | 93,204 |  |   | $ | 8,670 |  |   | 9.3 |  |
|                                   |   |   |   |   |   |   |   |   |
| North America, primarily United States |   | $ | 63,101 |  |   | $ | 56,789 |  |   | $ | 6,312 |  |   | 11.1 |  |
| Europe, Middle East and Africa         |   | 23,614 |  |   | 23,540 |  |   | 74 |  |   | 0.3 |  |
| Asia                                   |   | 11,117 |  |   | 10,069 |  |   | 1,048 |  |   | 10.4 |  |
| Latin America                          |   | 4,042 |  |   | 2,806 |  |   | 1,236 |  |   | 44.0 |  |
| Total revenue                          |   | $ | 101,874 |  |   | $ | 93,204 |  |   | $ | 8,670 |  |   | 9.3 |  |

|         |                                                                                                                                                                                                                       |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Product revenue increased by $10.5 million, or 12.7%, in the first six 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 $1.8 million, or 17.1%, in the first six months of fiscal 2015 compared to the prior year's comparable period as a result of completing fewer contracts. |

|         |                                                                                                                                                                                                                                              |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Total revenue in the first six months of 2015 was unfavorably impacted by foreign currency translation of $1.5 million when compared to the same period in the prior fiscal year as a result of the weakening of the Euro and British Pound. |

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

|         |                                                                                                                                                                                                                                 |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Our cash and cash equivalents and marketable securities balance, including long-term marketable securities, was $92.4 million at March 31, 2015, an increase of $0.4 million over the comparable balance at September 30, 2014. |

|         |                                                           |
|---------|-----------------------------------------------------------|
| • | We had no debt on the balance sheet as of March 31, 2015. |

|         |                                                                                               |
|---------|-----------------------------------------------------------------------------------------------|
| • | At March 31, 2015, our current ratio was 6.9 to 1 compared to 6.8 to 1 at September 30, 2014. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Contour Networks’ industry-first PCI Certified Private Cellular Network provides ATM, Point-of-Sale (POS), vending, and healthcare kiosk customers with the opportunity to avoid costly regulatory audits, while keeping their customers’ information safe and their brands protected.  The global network and payment provider selected Digi TransPort® WR11 and WR21 routers to provide consistent uptime and reliability to its global portfolio. |

|         |                                                                                                                                                                                                                                                                                                                                            |
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | IGT, the world's largest lottery business, was chosen by the government of Mexico to provide 11,000 new lottery terminals equipped with Digi TransPort® WR cellular routers for terminal connectivity.  The new lottery units will replace current kiosks throughout the country and provide instant ticket and draw-based games. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | One of America's leading rail transportation companies has once again partnered with Digi.  By selecting Digi’s TransPort® WR21 4G LTE router, the organization will replace costly wireline solutions that were becoming a burden to support.  Digi’s LTE cellular routers allow a drop-in, dedicated connection across the entire network, spanning 32,000 miles.  The Digi technology will also provide improved data transfer rates and cost savings over existing hard-wired legacy connections. |

|         |                                                                                                                                                                                                                                                                                                 |
|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | A pioneer of home and business security technology with more than 25 brands sold in nearly 130 countries has selected the Digi ConnectCardTM for i.MX28 to leverage wireless capabilities for remote operation of digital locks in order to improve security and efficiency in facilities. |

|         |                                                                                                                                                                                                                                                                                                                                        |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | A leading manufacturer and distributor of innovative sensing solutions including thermal imaging systems, visible-light imaging systems and measurement and diagnostic systems chose to design Digi International’s ConnectCore® CC6 into a new range of thermal image cameras for professional and commercial markets. |

|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| • | Seattle Sports Sciences, Inc. changes how soccer teams train with their flagship product, the SideKick® soccer training machine.  Now, as a result of their collaboration with Digi International, they will release their next generation of products, a revolutionary control and automation suite under the ISOTechneTM brand.  ISOTechneTM supports pre-defined programs that combine delivery of the ball with movement of players and skill in playing the ball.  By utilizing Digi Wireless Design Services' expertise and Digi XBee® technology, Seattle Sport Sciences has |

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

|                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                                  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                                                                                                                                                                                                             | Three months ended March 31, |   | Six months ended March 31, |
|                                                                                                                                                                                                                                             | 2015 |   | 2014 |   | 2015 |   | 2014 |
| Net income and net income per common share, diluted                                                                                                                                                                                              | $ | 1,446 |  |   | $ | 0.06 |  |   | $ | 738 |  |   | $ | 0.03 |  |   | $ | 1,107 |  |   | $ | 0.04 |  |   | $ | 1,426 |  |   | $ | 0.05 |  |
| Restructuring reserve, net of taxes                                                                                                                                                                                                              | 337 |  |   | 0.01 |  |   | — |  |   | — |  |   | 337 |  |   | 0.01 |  |   | 53 |  |   | NM |  |
| Proceeds from insurance recovery, net of taxes                                                                                                                                                                                                   | (659 | ) |   | (0.03 | ) |   | — |  |   | — |  |   | (659 | ) |   | (0.03 | ) |   | — |  |   | — |  |
| Discrete tax benefits for extended research and development tax credits and expiration of statute of limitations in various tax jurisdictions, and re-measurement and reversal of certain tax reserves as a result of a federal income tax audit | 1 |  |   | NM |  |   | (1,105 | ) |   | (0.04 | ) |   | (487 | ) |   | (0.02 | ) |   | (1,320 | ) |   | (0.05 | ) |
| Non-GAAP net income (loss) and net income (loss) per diluted share*                                                                                                                                                                              | $ | 1,125 |  |   | $ | 0.04 |  |   | $ | (367 | ) |   | $ | (0.01 | ) |   | $ | 298 |  |   | $ | 0.01 |  |   | $ | 159 |  |   | $ | 0.01 |  |
| Diluted weighted average common shares                                                                                                                                                                                                           |   |   | 25,273 |  |   |   |   | 26,144 |  |   |   |   | 24,816 |  |   |   |   | 26,189 |  |

|                                |
|--------------------------------|
|                                |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                           | Three months ended March 31, |   | Six months ended March 31, |
|                           | 2015 |   | 2014 |   | 2015 |   | 2014 |
|                           |   |   | % of totalrevenue |   |   |   | % of totalrevenue |   |   |   | % of totalrevenue |   |   |   | % of totalrevenue |
| Total revenue                  | $ | 53,151 |  |   | 100.0 | % |   | $ | 45,882 |  |   | 100.0 | % |   | $ | 101,874 |  |   | 100.0 | % |   | $ | 93,204 |  |   | 100.0 | % |
|                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net income                     | $ | 1,446 |  |   |   |   | $ | 738 |  |   |   |   | $ | 1,107 |  |   |   |   | $ | 1,426 |  |   |   |
| Recovery of insurance proceeds | (1,014 | ) |   |   |   | — |  |   |   |   | (1,014 | ) |   |   |   | — |  |   |   |
| Interest income, net           | (54 | ) |   |   |   | (49 | ) |   |   |   | (92 | ) |   |   |   | (92 | ) |   |   |
| Income tax provision (benefit) | 874 |  |   |   |   | (1,317 | ) |   |   |   | 19 |  |   |   |   | (1,241 | ) |   |   |
| Depreciation and amortization  | 1,460 |  |   |   |   | 1,870 |  |   |   |   | 2,982 |  |   |   |   | 3,719 |  |   |   |
| Adjusted EBITDA*               | $ | 2,712 |  |   | 5.1 | % |   | $ | 1,242 |  |   | 2.7 | % |   | $ | 3,002 |  |   | 2.9 | % |   | $ | 3,812 |  |   | 4.1 | % |

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

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

|                               |
|-------------------------------|
|                               |  |  |
| Steve Snyder                  |   | Tom Caden |
| Digi International            |   | Dian Griesel Int'l. |
| 952-912-3637                  |   | 212-825-3210 |
| Email:  steve.snyder@digi.com |   | Email:  tcaden@dgicomm.com |
|                          |   |   |

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

|                                   |
|-----------------------------------|
|                                   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                              | Three months endedMarch 31, |   | Six months endedMarch 31, |
|                              | 2015 |   | 2014 |   | 2015 |   | 2014 |
| Revenue:                          |   |   |   |   |   |   |   |
| Hardware product                  | $ | 48,108 |  |   | $ | 40,560 |  |   | $ | 93,041 |  |   | $ | 82,549 |  |
| Service                           | 5,043 |  |   | 5,322 |  |   | 8,833 |  |   | 10,655 |  |
| Total revenue                     | 53,151 |  |   | 45,882 |  |   | 101,874 |  |   | 93,204 |  |
| Cost of sales:                    |   |   |   |   |   |   |   |
| Cost of hardware product          | 25,498 |  |   | 20,012 |  |   | 48,610 |  |   | 40,275 |  |
| Cost of service                   | 3,575 |  |   | 4,090 |  |   | 7,264 |  |   | 8,241 |  |
| Total cost of sales               | 29,073 |  |   | 24,102 |  |   | 55,874 |  |   | 48,516 |  |
| Gross profit                      | 24,078 |  |   | 21,780 |  |   | 46,000 |  |   | 44,688 |  |
| Operating expenses:               |   |   |   |   |   |   |   |
| Sales and marketing               | 10,299 |  |   | 10,399 |  |   | 21,091 |  |   | 20,618 |  |
| Research and development          | 7,779 |  |   | 7,411 |  |   | 15,341 |  |   | 14,668 |  |
| General and administrative        | 4,540 |  |   | 4,619 |  |   | 9,728 |  |   | 9,342 |  |
| Restructuring charges, net        | 518 |  |   | — |  |   | 518 |  |   | 81 |  |
| Total operating expenses          | 23,136 |  |   | 22,429 |  |   | 46,678 |  |   | 44,709 |  |
| Operating income (loss)           | 942 |  |   | (649 | ) |   | (678 | ) |   | (21 | ) |
| Other income, net:                |   |   |   |   |   |   |   |
| Interest income, net              | 54 |  |   | 49 |  |   | 92 |  |   | 92 |  |
| Other income, net                 | 1,324 |  |   | 21 |  |   | 1,712 |  |   | 114 |  |
| Total other income, net           | 1,378 |  |   | 70 |  |   | 1,804 |  |   | 206 |  |
| Income (loss) before income taxes | 2,320 |  |   | (579 | ) |   | 1,126 |  |   | 185 |  |
| Income tax provision (benefit)    | 874 |  |   | (1,317 | ) |   | 19 |  |   | (1,241 | ) |
| Net income                        | $ | 1,446 |  |   | $ | 738 |  |   | $ | 1,107 |  |   | $ | 1,426 |  |
| Net income per common share:      |   |   |   |   |   |   |   |
| Basic                             | $ | 0.06 |  |   | $ | 0.03 |  |   | $ | 0.05 |  |   | $ | 0.06 |  |
| Diluted                           | $ | 0.06 |  |   | $ | 0.03 |  |   | $ | 0.04 |  |   | $ | 0.05 |  |
| Weighted average common shares:   |   |   |   |   |   |   |   |
| Basic                             | 24,492 |  |   | 25,644 |  |   | 24,319 |  |   | 25,680 |  |
| Diluted                           | 25,273 |  |   | 26,144 |  |   | 24,816 |  |   | 26,189 |  |

----

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

|                                                                                        |
|----------------------------------------------------------------------------------------|
|                                                                                        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                                                   | Three months endedMarch 31, |   | Six months endedMarch 31, |
|                                                                                   | 2015 |   | 2014 |   | 2015 |   | 2014 |
| Net income                                                                             | $ | 1,446 |  |   | $ | 738 |  |   | $ | 1,107 |  |   | $ | 1,426 |  |
| Other comprehensive (loss) income, net of tax:                                         |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                | (3,356 | ) |   | (181 | ) |   | (5,729 | ) |   | 162 |  |
| Change in net unrealized gain (loss) on investments                                    | 23 |  |   | 26 |  |   | (6 | ) |   | 64 |  |
| Less income tax (provision) benefit                                                    | (9 | ) |   | (10 | ) |   | 2 |  |   | (25 | ) |
| Reclassification of realized loss on investments included  in net income (1) | 1 |  |   | — |  |   | 1 |  |   | — |  |
| Other comprehensive (loss) income, net of tax                                          | (3,341 | ) |   | (165 | ) |   | (5,732 | ) |   | 201 |  |
| Comprehensive (loss) income                                                            | $ | (1,895 | ) |   | $ | 573 |  |   | $ | (4,625 | ) |   | $ | 1,627 |  |

----

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

|                                                  |
|--------------------------------------------------|
|                                                  |  |  |  |  |  |  |  |
|                                             | March 31, 2015 |   | September 30, 2014 |
| ASSETS                                           |   |   |   |
| Current assets:                                  |   |   |   |
| Cash and cash equivalents                        | $ | 45,657 |  |   | $ | 47,490 |  |
| Marketable securities                            | 39,220 |  |   | 32,898 |  |
| Accounts receivable, net                         | 28,615 |  |   | 28,576 |  |
| Inventories                                      | 33,881 |  |   | 31,247 |  |
| Deferred tax assets                              | 3,388 |  |   | 3,221 |  |
| Other                                            | 4,877 |  |   | 4,249 |  |
| Total current assets                             | 155,638 |  |   | 147,681 |  |
| Marketable securities, long-term                 | 7,550 |  |   | 11,541 |  |
| Property, equipment and improvements, net        | 14,617 |  |   | 13,231 |  |
| Identifiable intangible assets, net              | 5,348 |  |   | 6,785 |  |
| Goodwill                                         | 101,742 |  |   | 103,398 |  |
| Deferred tax assets                              | 5,087 |  |   | 7,383 |  |
| Other                                            | 320 |  |   | 440 |  |
| Total assets                                     | $ | 290,302 |  |   | $ | 290,459 |  |
| LIABILITIES AND STOCKHOLDERS’ EQUITY       |   |   |   |
| Current liabilities:                             |   |   |   |
| Accounts payable                                 | $ | 11,375 |  |   | $ | 10,451 |  |
| Accrued compensation                             | 7,677 |  |   | 8,133 |  |
| Other                                            | 3,421 |  |   | 3,170 |  |
| Total current liabilities                        | 22,473 |  |   | 21,754 |  |
| Income taxes payable                             | 1,893 |  |   | 2,724 |  |
| Deferred tax liabilities                         | 322 |  |   | 272 |  |
| Other noncurrent liabilities                     | 481 |  |   | 411 |  |
| Total liabilities                                | 25,169 |  |   | 25,161 |  |
|                                             |   |   |   |
| Total stockholders’ equity                 | 265,133 |  |   | 265,298 |  |
| Total liabilities and stockholders’ equity | $ | 290,302 |  |   | $ | 290,459 |  |

----

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

|                                                                                                                |
|----------------------------------------------------------------------------------------------------------------|
|                                                                                                                |  |  |  |  |  |  |  |
|                                                                                                           | Six months ended March 31, |
|                                                                                                           | 2015 |   | 2014 |
| Operating activities:                                                                                          |   |   |   |
| Net income                                                                                                     | $ | 1,107 |  |   | $ | 1,426 |  |
| Adjustments to reconcile net income to net cash provided by operating activities:                              |   |   |   |
| Depreciation of property, equipment and improvements                                                           | 1,445 |  |   | 1,828 |  |
| Amortization of identifiable intangible assets                                                                 | 1,537 |  |   | 1,891 |  |
| Stock-based compensation                                                                                       | 2,222 |  |   | 2,070 |  |
| Excess tax benefits from stock-based compensation                                                              | — |  |   | (44 | ) |
| Deferred income tax provision (benefit)                                                                        | 2,212 |  |   | (1,065 | ) |
| Gain on insurance settlement related to property and equipment                                                 | (989 | ) |   | — |  |
| Bad debt/product return provision                                                                              | 518 |  |   | (151 | ) |
| Inventory obsolescence                                                                                         | 476 |  |   | 409 |  |
| Restructuring charges, net                                                                                     | 518 |  |   | 81 |  |
| Other                                                                                                          | (27 | ) |   | 46 |  |
| Changes in operating assets and liabilities                                                                    | (7,459 | ) |   | (9,681 | ) |
| Net cash provided by (used in) operating activities                                                            | 1,560 |  |   | (3,190 | ) |
| Investing activities:                                                                                          |   |   |   |
| Purchase of marketable securities                                                                              | (22,099 | ) |   | (5,157 | ) |
| Proceeds from maturities of marketable securities                                                              | 19,763 |  |   | 13,778 |  |
| Proceeds from insurance settlement related to property and equipment                                           | 1,014 |  |   | — |  |
| Proceeds from sale of property and equipment                                                                   | 45 |  |   | — |  |
| Purchase of property, equipment, improvements and certain     other intangible assets | (3,035 | ) |   | (1,921 | ) |
| Net cash (used in) provided by investing activities                                                            | (4,312 | ) |   | 6,700 |  |
| Financing activities:                                                                                          |   |   |   |
| Excess tax benefits from stock-based compensation                                                              | — |  |   | 44 |  |
| Proceeds from stock option plan transactions                                                                   | 6,006 |  |   | 3,209 |  |
| Proceeds from employee stock purchase plan transactions                                                        | 505 |  |   | 561 |  |
| Purchases of common stock                                                                                      | (2,339 | ) |   | (5,416 | ) |
| Net cash provided by (used in) financing activities                                                            | 4,172 |  |   | (1,602 | ) |
| Effect of exchange rate changes on cash and cash equivalents                                                   | (3,253 | ) |   | 329 |  |
| Net (decrease) increase in cash and cash equivalents                                                           | (1,833 | ) |   | 2,237 |  |
| Cash and cash equivalents, beginning of period                                                                 | 47,490 |  |   | 41,320 |  |
| Cash and cash equivalents, end of period                                                                       | $ | 45,657 |  |   | $ | 43,557 |  |