use NetAddr::IP; my %w = ('broadcast' => [ '255.255.255.255', '255.255.255.255' ], 'default' => [ '0.0.0.0', '0.0.0.0' ], 'loopback' => [ '127.0.0.1', '255.0.0.0' ], '10.' => [ '10.0.0.0', '255.0.0.0' ], '11.11.' => [ '11.11.0.0', '255.255.0.0' ], '12.12.12.' => [ '12.12.12.0', '255.255.255.0' ], '13.13.13.13' => [ '13.13.13.13', '255.255.255.255' ], '0-127' => [ '0.0.0.0', '128.0.0.0' ], '128-255' => [ '128.0.0.0', '128.0.0.0' ], '0-63' => [ '0.0.0.0', '192.0.0.0' ], '128-191' => [ '128.0.0.0', '192.0.0.0' ], '10.128.0-127' => [ '10.128.0.0', '255.255.128.0' ], ); $| = 1; print '1..', (2 * scalar keys %w), "\n"; my $count = 1; for my $a (keys %w) { my $ip = new NetAddr::IP $a; if ($ip->addr eq $w{$a}->[0]) { print "ok ", $count++, "\n"; } else { print "not ok ", $count++, "\n"; } if ($ip->mask eq $w{$a}->[1]) { print "ok ", $count++, "\n"; } else { print "not ok ", $count++, "\n"; } }