IP subnet calculator IPv4 & IPng (IPv6) transform into IP netmask subnet broadcast host from to #hosts #IPs select a example IPv4 class A class B class C Multicast IPv6 reserved loopback internet first addresses internet new official IPv6 internet routing IPv6 to IPV4 multicast Link-local unicast IPv6 Site-local unicast local IPv4 to IPv6 6bone (for backbone research)