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EXHIBIT 21.1
PRESENT SUBSIDIARIES
PERCENTAGE
STATE OR OF VOTING
JURISDICTION SECURITIES
INCORPORATION OWNED
------------- -----
Teradyne Benelux, Inc. (Ltd.) ....................... Delaware 100%
Teradyne Canada Limited ............................. Canada 100%
Teradyne Control Automation, Inc. ................... Delaware 100%
Teradyne GmbH ....................................... Germany 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%
Teradyne Thailand Inc. .............................. Delaware 100%
Alternative Delivery Systems Support, Inc. .......... North Carolina 100%
Kinetrix, Inc. ...................................... Delaware 100%
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%
Zehntel, Sarl ....................................... France 100%
1000 Washington, Inc. ............................... Massachusetts 100%
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