IPv6 Subnet Calculator: Exact Prefixes & Address Ranges
Calculate IPv6 prefix boundaries and exact address counts with BigInt, inspect compressed and expanded notation and identify normalized host bits.
Enabling local controls…
1. IPv6 subnet
Local exact 128-bit arithmetic. Prefix /0–/128; embedded IPv4 accepted (hexadecimal output); no %zone or brackets. Up to 1 MiB; address up to 45 characters.
2. Range and notation
Enter a subnet or load a sample, then calculate.
How to use this tool
Enter an IPv6 address and prefix length. Compare the canonical prefix, first and last addresses and exact count before using the result in a network plan.
When not to use it
IPv6 has no broadcast address. Mathematical address counts are not usable-host counts, allocation rights, reachability or firewall validation.
Read the guide →