Exhibit 21.1

INTERNAP NETWORK SERVICES CORPORATION  

LIST OF SUBSIDIARIES

VitalStream Holdings, Inc.	Nevada
VitalStream, Inc.	Delaware
VitalStream  Broadcasting Corporation	Nevada
Playstream, Inc.	Nevada
VitalStream Advertising Services, Inc.	Nevada
CO Space, Inc.	Delaware
CO Space Services, LLC	Delaware
CO Space Properties, LLC	Delaware
CO Space Construction, LLC	Delaware
CO Space Services Texas, LP	Delaware
CO Space Properties Texas, LP	Delaware
Internap Network Services U.K. Limited	United Kingdom
Internap Network Services B.V.	Netherlands
Internap Technologies (Bermuda) Limited	Bermuda
Internap Technologies B.V.	Netherlands
Internap Network Services (HK) Limited	Hong Kong
Internap Network Services (Singapore) Pte Limited	Singapore
Internap Network Services (Australia) Ltd.	Australia
Internap Network Services Canada	Canada
Internap Japan Co., Ltd.*	Japan

* Not wholly-owned.