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Exhibit 10.33

Joinder Agreement
For
Tim Sullivan
 
The undersigned hereby agrees to be bound by the terms and conditions of the
Employment Security Plan of Internap Network Services, Inc., dated as of
November 14, 2007, as if he or she initially had executed such Plan as a party
thereto, and, without by implication limiting the foregoing, agrees to each
acknowledgment, covenant and other agreement contained therein.

Notwithstanding the provisions of the Employment Security Plan, the Applicable
Multiple for a Qualifying Termination During a Protection Period listed on
Schedule B shall be two (2).

 
/s/ Tim Sullivan
   
Tim Sullivan
               
November 13, 2007
   
Date
 

 
Accepted:
INTERNAP NETWORK SERVICES, INC.
 
By:
Eric Suddith
 
Its:
VP of Human Resources
 
Date:
November 13, 2007