'1.2.3.5' is being treated as a string (because of the '.'). You can split up the IP into an array, hence being able to increment any of the ip numbers: 

$ip="1.2.3.4";
@ipnum=split(/./,$ip);
$ipnum[$#ipnum]++; # this increments the last digit..

# then

$ip=join(".",@ipnum);

# result is '1.2.3.5';

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In reply to Re: Increment of ip address by cool_jr256
in thread Increment of ip address by mosh

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