Penetration Testing: IP Range

[John Madden <chiwawa999 () yahoo com>]

Hello,

Where just about to begin a pentest engagement and the
client wants us to know if we can find out how many IP
blocks they have. Is there a way to find out all the
IP blocks of a company ? You've got the usual e-mail
domain name to find at least one but what if they have
2,3 + IP blocks ?

Any ideas ?

thanks 

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