use NetAddr::IP; my @addr = ( [ '10.0.0.0/24', '10.0.0.1/32' ], [ '192.168.0.0/24', '192.168.0.1/32' ], [ '127.0.0.1/32', '127.0.0.1/32' ] ); $| = 1; print "1..", 1 * scalar @addr, "\n"; my $count = 1; for my $a (@addr) { my $ip = new NetAddr::IP $a->[0]; if (@$ip[0]->cidr eq $a->[1]) { print "ok $count\n"; } else { print "not ok $count\n"; } ++$count; }