Update:
As it has been mentioned , this does not work in many situations, please ignore my stupid ramblings .. the simple way .. 

use strict;

my $ip = '1.2.3.4';
my @ip = split(/\./,$ip);

$ip[3]++;

print join('.',@ip) , "\n";

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This is not a Signature...

In reply to Re: Increment of ip address by monkey_boy
in thread Increment of ip address by mosh

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