CIDR prefix
/11
255.224.0.0
2,097,150 usable hosts · 2,097,152 addresses
The mask for /11 is 255.224.0.0 — 2,097,152 addresses, 2,097,150 usable hosts. Large enterprise and carrier networks.
Mask
255.224.0.0
Wildcard
0.31.255.255
Addresses
2,097,152
Hosts
2,097,150
Worked example: 10.0.0.0/11
Network address10.0.0.0/11
Broadcast address10.31.255.255
First host10.0.0.1
Last host10.31.255.254
FAQ — /11
What is the subnet mask for /11?
The subnet mask for /11 is 255.224.0.0 (wildcard: 0.31.255.255). The first 11 bits are the network part, the remaining 21 are the host part.
How many hosts fit in a /11?
A /11 block holds 2,097,152 addresses, of which 2,097,150 are usable hosts (the network and broadcast addresses are excluded).
How many /11 subnets fit in a /8?
A /8 network divides into 8 /11 subnets.
What is a /11 used for?
Large enterprise and carrier networks.