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IPv6 CIDR Calculator
Work out the network address, first and last address, address count, type, and ip6.arpa zone for an IPv6 prefix.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Prefix details
| Network address | — |
|---|---|
| Network (expanded) | — |
| First address | — |
| Last address | — |
| Prefix length | — |
| Prefix mask | — |
| Address count | — |
| Address count (power of two) | — |
| Type | — |
| Scope | — |
| Reverse DNS zone | — |
How it works
Enter an address with an optional /prefix (defaults to /128). Host bits are cleared to give the network address. IPv6 has no broadcast address, so "last address" is simply the all-ones host address. The reverse zone is truncated to the nibble boundary at or below the prefix length. Type is derived from the assigned-block registry.