Bitcricket ushers in a modern era re-write of the orginal and very popular IP Subnet Caluculator written over a decade ago at Net3 Group (acquired by WildPackets). The new version has a refreshed GUI, native Windows or Mac opertaion (OS X on either PPC or Intel-based hardware) and support for IPv6. Perfect for supporting your IPv4 network. Perfect for learning Pv6. Perfect for migration.