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