1
EXHIBIT 22.1
PRESENT SUBSIDIARIES
PERCENTAGE
STATE OR OF VOTING
JURISDICTION SECURITIES
INCORPORATION OWNED
------------- ----------
Teradyne Assembly GmbH Ltd. ............................... Germany 100%
Teradyne Benelux, Inc. (Ltd.) ............................. Delaware 100%
Teradyne Canada Limited.................................... Canada 100%
Teradyne Control Automation, Inc. ......................... Delaware 100%
Teradyne GmbH.............................................. Germany 100%
Teradyne Holdings, Inc. ................................... New Hampshire 100%
Teradyne Holdings Limited.................................. United Kingdom 100%
Teradyne Limited.................................... United Kingdom 100%
Teradyne Hong Kong, Ltd. .................................. Delaware 100%
Teradyne International, Ltd. .............................. Barbados 100%
Teradyne Ireland Limited................................... Ireland 100%
Teradyne Italia S.r.L. .................................... Italy 100%
Teradyne Japan, Ltd. ...................................... Delaware 100%
Teradyne K.K. ...................................... Japan 100%
Teradyne Korea, Ltd. ...................................... Delaware 100%
Teradyne Leasing, Inc. .................................... Massachusetts 100%
Teradyne Malaysia, Ltd. ................................... Delaware 100%
Teradyne de Mexico, S.A. de C.V............................ Mexico 100%
Teradyne Midnight Networks Inc. ........................... Delaware 100%
Teradyne Netherlands B.V. ................................. Netherlands 100%
Teradyne Netherlands, Ltd. ................................ Delaware 100%
Teradyne Realty, Inc. ..................................... Massachusetts 100%
Teradyne RSW Software, Inc................................. Delaware 100%
RSW Software, Inc..................................... Massachusetts 100%
Teradyne S.A. ............................................. France 100%
Teradyne Scandinavia, Inc. ................................ Delaware 100%
Teradyne Singapore, Ltd. .................................. Delaware 100%
Teradyne Software and Systems Test, Inc. .................. Delaware 100%
Teradyne Taiwan, Ltd. ..................................... Delaware 100%
Kinetrix, Inc. ............................................ Delaware 83%
Hammer Technologies, Inc. ................................. Massachusetts 100%
Megatest Corporation....................................... Delaware 100%
Megatest Limited.................................... United Kingdom 100%
Megatest SARL....................................... France 100%
Megatest GmbH....................................... Germany 100%
Megatest H.K. Ltd. ................................. Hong Kong 100%
Teradyne Philippines Ltd. .......................... California 100%
Megatest International Sales Corporation............ Barbados 100%
Megatest Asia Pte. Ltd. ............................ Singapore 100%
Softbridge, Inc............................................ Delaware 100%
Zehntel Holdings, Inc. .................................... California 100%
1000 Washington, Inc. ..................................... Massachusetts 100%