Compute IPv4 and IPv6 subnet details from any CIDR block — netmask, wildcard, host ranges, IP class, and VLSM allocation. Instant, free, no sign-up.
Type CIDR like 192.168.1.10/24, or enter IP and pick prefix from the dropdown.
Enter an IPv6 address with prefix length, e.g. 2001:db8::/32 or fe80::1%eth0/64.
Subnets are allocated largest-first from the base network.
| # | Name / Label | Subnet (CIDR) | Netmask | Network Addr | Broadcast | First Host | Last Host | Usable Hosts | Requested |
|---|