In case the hash doesn't contain the entire possible universe of domain names, you may want to offer a fall back. 
use Regexp::Common;
s/ ( $RE{net}{IPv4} ) / $hash{$1} || $1 /xge;

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In reply to Re: Re: Search and replace in an array using data in hash by halley
in thread Search and replace in an array using data in hash by monger

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