Exhibit 21.1

SUBSIDIARIES OF REGISTRANT

Rambus Delaware LLC    

Rambus Deutschland GmbH (Germany)

Rambus International Ltd.

Rambus K.K. (Japan)

Rambus Ltd. (Grand Cayman Islands, BWI)

Rambus Chip Technologies (India) Private Limited

Rambus Korea, Inc. (Korea)

Rambus France

Cryptography Research, Inc.

Unity Semiconductor Corporation

Kamiyacho IP Holdings

Mozaik Multimedia, Inc.