Exhibit 21.1

KLA-Tencor Corporation

List of Subsidiaries

Name

State or Other Jurisdiction of
Incorporation

DOMESTIC SUBSIDIARIES

Phase Shift Technology, Inc.

Arizona

Blue 29 Corporation

California

International Sales & Business, Inc.

California

KLA-Tencor Building Corporation

California

KLA-Tencor China Corporation

California

KLA-Tencor DISC Corporation

California

KLA-Tencor International Corporation

California

KLA-Tencor Instruments Klinnik Corporation

California

KLA-Tencor Technologies Corporation

California

SensArray Corporation

California

Sensys Instruments Corporation

California

Therma-Wave Domestic International Sales Corporation

California

VLSI Standards, Inc.

California

ADE International Corporation

Delaware

FabSolve, LLC

Delaware

KLA-Tencor Asia-Pac Distribution Corporation

Delaware

OnWafer Technologies, Inc.

Delaware

Therma-Wave, Inc.

Delaware

ADE Corporation

Massachusetts

ADE Optical Systems Corporation

Massachusetts

ADE Securities Corp.

Massachusetts

ADE Software Corporation

Massachusetts

ADE Technologies, Inc.

Massachusetts

INTERNATIONAL SUBSIDIARIES

ATI Foreign Sales Corporation

Barbados

Lee Ta Technologies (BVI), Inc.

British Virgin Islands

KLA-Tencor Corporation (Cayman) Limited, I

Cayman Islands

KLA-Tencor Corporation (Cayman) Limited, II

Cayman Islands

KLA-Tencor Corporation (Cayman) Limited, III

Cayman Islands

KLA-Tencor Corporation (Cayman) Limited, IV

Cayman Islands

KLA-Tencor Semiconductor Equipment Technology (Shanghai) Co., Ltd.

China

Therma-Wave (Shanghai) Co., Ltd

China

KLA-Tencor France SARL

France

ADE International GmbH

Germany

KLA-Tencor GmbH

Germany

KLA-Tencor Software India Private Limited

India

KLA-Tencor Ireland Ltd.

Ireland

KLA-Tencor Corporation (Israel)

Israel

KLA-Tencor控股(1987)有限公司

Israel

KLA-Tencor Corporation (1992) Ltd.

Israel

KLA-Tencor Integrated Metrology (Israel) (2002) Ltd.

Israel

KLA-Tencor Italy S.R.L.

Italy

Japan ADE, Ltd.

Japan

KLA-Tencor Japan, Ltd.

Japan

SensArray Japan Corporation

Japan


Name

State or Other Jurisdiction of
Incorporation

INTERNATIONAL SUBSIDIARIES (continued)

Therma-Wave (Japan), K.K.

Japan

VLSI Standards, K.K.

Japan

KLA-Tencor Korea, Inc.

Korea

KLA-Tencor (Malaysia) Sdn Bhd

Malaysia

KLA-Tencor (Singapore) PTE, Ltd.

Singapore

KLA-Tencor Singapore Holding Co. PTE. Ltd.

Singapore

KLA Instruments S.A.

Switzerland

KLA-Tencor Yield Management Software Taiwan Corporation

Taiwan

KLA-Tencor (Thailand) Ltd.

Thailand

KLA-Tencor有限

United Kingdom

KLA-Tencor (Service) Limited

United Kingdom

Therma-Wave, Ltd.

United Kingdom
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