IPv4/IPv6 Subnet Calculator

Enter an IPv4 or IPv6 address (with CIDR or netmask) to calculate network details.

Accepted formats:

  • IPv4 CIDR: 10.0.0.1/22
  • IPv4 Netmask: 10.0.0.1/255.255.252.0
  • IPv6 CIDR: fe80::1ff:fe23:4567:890a/64