IPv6 subnet calculator
Prefix boundaries and subnet counts for any IPv6 network.
- Address
- 2001:db8:1234::
- Network address
- 2001:db8:1234::/48
- Network expanded
- 2001:0db8:1234:0000:0000:0000:0000:0000
- First address
- 2001:db8:1234::
- Last address
- 2001:db8:1234:ffff:ffff:ffff:ffff:ffff
- Total addresses
- 1208925819614629174706176
- /64 networks
- 65536
- Mask in hex
- 0xffffffffffff00000000000000000000
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Runs entirely in your browser — nothing you enter is sent to us.