Pentesting a Web Applicaton behind Akamai Technology

[grd () netexpert ch]

Hi everybody,
 
I'm doing a Pentest on a Web Application for a client. The only information I have is the DNS name of the website. 
After doing the basic steps of footprint and enumeration, I found out that the IP adress of the website is not in the 
IP range of the client and is owned by Akamai Technology. It means that if I'm going on with the furter steps of 
pentesting, I'll pentest Akamai and not the "real" website of the client.
 
Is there a way to find the "real" IP address of the website ?
 
Has everyone faced this kind of configuration ?
 
For information, this is the header of the website when attempting a page that doesn't exist :
 
HTTP/1.0 400 Bad Request
Server: AkamaiGHost
Mime-Version: 1.0
Content-Type: text/html
Content-Length: 186
Expires: Wed, 16 May 2007 13:39:42 GMT
Date: Wed, 16 May 2007 13:39:42 GMT
Connection: close
 
Thanks,
 
Greg

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