print IsInRange ("192.168.2.42","192.168.0.0/16"),"\n";  # 1
print IsInRange ("192.168.2.42","192.168.0.0/24"),"\n";  # undef
print IsInRange ("192.168.2.42","192.168.2.0/24"),"\n";  # 1
print IsInRange ("24.123.234.1","24.0.0.0/8"),"\n";      # 1