NetAddr::IP gives you a convenient way to do what you want.
Say you know your home IP address can be in the range 10.0.0.0 to 10.0.0.255 (or 10.0.0/24, in proper CIDR notation). Your code could then...
my $home_net = new NetAddr::IP '10.0.0/24';
my ($string_ip, $rest) = split(/\s+/, $_, 2);
my $ip = new NetAddr::IP $string_ip;
next if $home_net->contains($ip);
# Happily process $string_ip and $rest as it is not from your home n
-lem, but some call me fokat
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