IPv6 /128 Subnet
A single address: loopbacks, routed addresses on VMs and firewall rules for one host. Enter any address below to see its /128 block.
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Examples:
IPv6 network
1 addresses
Documentation
Details
First Address
Last Address
Total Addresses
Expanded
Subnet Calculator
IPv6 /128 at a glance
Prefix/128
Total Addresses1
Host Bits0
Hex Digits Fixed32
An IPv6 /128 fixes the first 128 of 128 bits. That is exactly 32 hex digits, so the boundary falls cleanly between digits, which makes addresses easy to read.
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 /128?
None: a /128 is smaller than a /64.
How many addresses are in an IPv6 /128?
1.
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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Every address on your network, watched
Frabs maps each IP to the VM that owns it and stops the abuse coming from it, on Proxmox, Virtualizor, VirtFusion and SolusVM.