EXHIBIT 21.1



SUBSIDIARIES OF MERCURY INTERACTIVE CORPORATION



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|SUBSIDIARY LEGAL NAME                                               |  | JURISDICTION OF INCORPORATION
|Mercury Interactive Austria GesmbH                                  |  | Austria                      
|Mercury Interactive Brasil Limitada                                 |  | Brazil                       
|Mercury Interactive Canada, Inc.                                    |  | Canada                       
|Mercury Interactive A/S                                             |  | Denmark                      
|Mercury Interactive Oy                                              |  | Finland                      
|Mercury Interactive (Hong Kong) Limited                             |  | Hong Kong                    
|Mercury Interactive (Israel) Limited                                |  | Israel                       
|Mercury Interactive (Australia) Pty Ltd. (1)                        |  | Australia                    
|Mercury Interactive Srl (2)                                         |  | Italy                        
|Mercury Interactive Japan K.K.                                      |  | Japan                        
|Mercury Interactive (Korea) Co. Ltd.                                |  | Korea                        
|Mercury Interactive B.V.                                            |  | Netherlands                  
|Mercury Interactive (Luxembourg) S.A.                               |  | Luxembourg                   
|Mercury Interactive (Europe) B.V. (Holding Company  Not operating) |  | Netherlands                  
|Mercury Interactive France S.A.S.                                   |  | France                       
|Mercury Interactive Germany GmbH                                    |  | Germany                      
|Mercury Interactive (UK) Limited                                    |  | United Kingdom               
|Mercury Interactive (Singapore) Pte Ltd.                            |  | Singapore                    
|Mercury Interactive Sales and Service India Private Limited (3)     |  | India                        
|Mercury Interactive SA (Pty) Ltd.                                   |  | South Africa                 
|Mercury Interactive S.L. Unipersonal                                |  | Spain                        
|Mercury Interactive Nordic AB                                       |  | Sweden                       
|Mercury Interactive (Switzerland) GmbH                              |  | Switzerland                  
|Mercury Interactive Freshwater, Inc.                                |  | California                   
|Performant, Inc.                                                    |  | Delaware                     
|Kanga Acquisition LLC                                               |  | Delaware                     

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|(1) |  | 50% interest owned by Mercury Interactive Corporation and 50% interest owned by Mercury Interactive (Israel) Limited
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|(2) |  | 95% interest owned by Mercury Interactive Corporation and 5% interest owned by Mercury Interactive B.V.
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|(3) |  | 99% interest owned by Mercury Interactive Corporation and 1% interest owned by Mercury Interactive (Singapore) Pte Ltd.
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