**Exhibit 21.1**

 

SUBSIDIARIES OF INFORMATION HOLDINGS INC.

 
| **NAME**                                                |   | **STATE OF  INCORPORATION  OR ORGANIZATION** |
|---------------------------------------------------------|--------|----------------------------------------------|
|                                                    |   |                                         |
| Information Ventures LLC                                |   |                                         | Delaware |
|                                                    |   |                                         |   |
| MicroPatent LLC                                         |   |                                         | Delaware |
|                                                    |   |                                         |   |
| Optipat, Inc.                                           |   |                                         | Virginia |
|                                                    |   |                                         |   |
| MicroPatent (UK) LLC                                    |   |                                         | Delaware |
|                                                    |   |                                         |   |
| Master Data Center, Inc.                                |   |                                         | Michigan |
|                                                    |   |                                         |   |
| Dalton I LLC (f/k/a Transcender LLC)                    |   |                                         | Delaware |
|                                                    |   |                                         |   |
| Liquent Inc.                                            |   |                                         | Delaware |
|                                                    |   |                                         |   |
| Liquent, Ltd.                                           |   |                                         | United Kingdom |
|                                                    |   |                                         |   |
| Liquent Holdings Ltd.                                   |   |                                         | United Kingdom |
|                                                    |   |                                         |   |
| IDRAC Holdings SAS                                      |   |                                         | France |
|                                                    |   |                                         |   |
| IDRAC SAS                                               |   |                                         | France |
|                                                    |   |                                         |   |
| CDC Solutions Ltd.                                      |   |                                         | United Kingdom |
|                                                    |   |                                         |   |
| CDC Solutions Inc.                                      |   |                                         | New Jersey |
|                                                    |   |                                         |   |
| CDC Trustee Ltd.                                        |   |                                         | United Kingdom |
|                                                    |   |                                         |   |
| PINC (I) Inc. (f/k/a Parthenon Publishing  Group, Inc.) |   |                                         | New York |
|                                                    |   |                                         |   |
| India LLC                                               |   |                                         | Delaware |
|                                                    |   |                                         |   |
| India 2 LLC                                             |   |                                         | Delaware |

 

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