use NetAddr::IP::Lite; my $nets = { '10.0.0.0/20' => [ 167772160, 4294963200 ], '10.0.15.0/24' => [ 167776000, 4294967040 ], '192.168.0.0/24' => [ 3232235520, 4294967040], 'broadcast' => [ 4294967295, 4294967295], 'default' => [ 0, 0 ], }; $| = 1; print "1..", 4 * (scalar keys %$nets), "\n"; my $count = 1; for my $a (keys %$nets) { my $ip = new NetAddr::IP::Lite $a; my ($addr, $mask) = $ip->numeric; my $nip = new NetAddr::IP::Lite $addr, $mask; print '', ($nip ? '' : 'not '), 'ok ', $count++, "\n"; print '', ($nip and $nip->cidr eq $ip->cidr) ? '' : 'not ', 'ok ', $count ++, "\n"; print '', (($addr != $nets->{$a}->[0] ? 'not ' : ''), "ok ", $count++, "\n"); print '', (($mask != $nets->{$a}->[1] ? 'not ' : ''), "ok ", $count++, "\n"); }