You might want to look at Matching an IP address for the regex needed to match/grab the IP address, and then use Net::Whois to do the lookup.

Update:Net::DNS::RR::PTR is a better module for this, sleep helps you think better sometimes.

In reply to Re: resolving ip's to names in a text file by lshatzer
in thread resolving ip's to names in a text file by RayRay459

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