CIDR prefix
/5
248.0.0.0
134,217,726 usable hosts · 134,217,728 addresses
The mask for /5 is 248.0.0.0 — 134,217,728 addresses, 134,217,726 usable hosts. Huge blocks used only by registries and carriers.
Mask
248.0.0.0
Wildcard
7.255.255.255
Addresses
134,217,728
Hosts
134,217,726
Worked example: 10.0.0.0/5
Network address8.0.0.0/5
Broadcast address15.255.255.255
First host8.0.0.1
Last host15.255.255.254
FAQ — /5
What is the subnet mask for /5?
The subnet mask for /5 is 248.0.0.0 (wildcard: 7.255.255.255). The first 5 bits are the network part, the remaining 27 are the host part.
How many hosts fit in a /5?
A /5 block holds 134,217,728 addresses, of which 134,217,726 are usable hosts (the network and broadcast addresses are excluded).
What is a /5 used for?
Huge blocks used only by registries and carriers.