CIDR prefix
/6
252.0.0.0
67,108,862 usable hosts · 67,108,864 addresses
The mask for /6 is 252.0.0.0 — 67,108,864 addresses, 67,108,862 usable hosts. Huge blocks used only by registries and carriers.
Mask
252.0.0.0
Wildcard
3.255.255.255
Addresses
67,108,864
Hosts
67,108,862
Worked example: 10.0.0.0/6
Network address8.0.0.0/6
Broadcast address11.255.255.255
First host8.0.0.1
Last host11.255.255.254
FAQ — /6
What is the subnet mask for /6?
The subnet mask for /6 is 252.0.0.0 (wildcard: 3.255.255.255). The first 6 bits are the network part, the remaining 26 are the host part.
How many hosts fit in a /6?
A /6 block holds 67,108,864 addresses, of which 67,108,862 are usable hosts (the network and broadcast addresses are excluded).
What is a /6 used for?
Huge blocks used only by registries and carriers.