IPv6 /127 Subnet
Two addresses, for point-to-point router links (RFC 6164). Enter any address below to see its /127 block.
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Examples:
IPv6 network
2 addresses
Documentation
Details
First Address
Last Address
Total Addresses
Expanded
Address Entered
Split Into Subnets
2001:db8:abcd:12::/1282001:db8:abcd:12:: – 2001:db8:abcd:12::
2001:db8:abcd:12::1/1282001:db8:abcd:12::1 – 2001:db8:abcd:12::1
Subnet Calculator
IPv6 /127 at a glance
Prefix/127
Total Addresses2
Host Bits1
Hex Digits Fixed31 and part of the next
An IPv6 /127 fixes the first 127 of 128 bits. That does not fall on a hex-digit boundary, so blocks are harder to read at a glance; nibble-aligned prefixes (multiples of 4) are preferred.
IPv6 has no broadcast address, so every address in the block can be used, but networks with hosts on them should be /64 so SLAAC and neighbour discovery work as designed.
Questions
How many /64s are in a /127?
None: a /127 is smaller than a /64.
How many addresses are in an IPv6 /127?
2.
What size IPv6 block should a hosting provider give each VM?
A /64 per VM is the cleanest: the customer can use any addresses inside it, and abuse handling and reverse DNS work per /64. A single /128 also works but some software expects a /64.
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