Exhibit 21.1

SUBSIDIARIES OF REGISTRANT

Rambus Canada Inc.

Rambus Controllers, Inc.

Rambus Delaware LLC    

Rambus International Ltd.

Rambus K.K. (Japan)

Rambus Ltd. (Grand Cayman Islands, BWI)

Rambus Chip Technologies (India) Private Limited

Rambus Korea, Inc. (South Korea)

Rambus Global Inc.

Rambus Information Technology Consulting (Shanghai) Co. Ltd.

Rambus UK Ltd.

Rambus ROTW Holding B.V.

Cryptography Research, Inc.

Mozaik Multimedia, Inc.

Unity Semiconductor Corporation

AnalogX Inc. (Canada)

PLDA Ltd (Bulgaria)

PLDA SAS (France)

PLDA Inc. (United States of America)

Hardent Inc. (Canada)