🧮 IPv4/IPv6 Subnet Calculator
Enter an address and a CIDR prefix (or, for IPv4, a dotted subnet mask) to compute the network, broadcast, and usable host range. Everything is computed locally.
IPv4
| Network address | — |
|---|---|
| Broadcast address | — |
| Usable host range | — |
| Usable hosts | — |
| Subnet mask (dotted) | — |
| Subnet mask (CIDR) | — |
| Wildcard mask | — |
IPv6
| Expanded address | — |
|---|---|
| Network prefix | — |
| First address | — |
| Last address | — |
| Addresses in range | — |