/11 Subnet Mask (255.224.0.0)
| Prefix | /11 |
|---|---|
| Subnet mask | 255.224.0.0 |
| Wildcard mask | 0.31.255.255 |
| Binary mask | 11111111.11100000.00000000.00000000 |
| Total addresses | 2,097,152 |
| Usable hosts | 2,097,150 |
| Host bits | 21 |
| Subnets of /11 in a /8 | 8 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 10.0.0.0 | |
|---|---|---|
| Broadcast address | 10.31.255.255 | |
| First usable host | 10.0.0.1 | |
| Last usable host | 10.31.255.254 | |
| Total addresses | 2,097,152 | |
| Usable hosts | 2,097,150 | |
| Subnet mask | 255.224.0.0 | |
| Wildcard mask | 0.31.255.255 | |
| CIDR notation | 10.0.0.0/11 | |
| IP class | Class A (legacy) | |
| Address type | Private (RFC 1918) | |
| IP address (binary) | 00001010.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11111111.11100000.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /11 subnet?
A /11 subnet uses the first 11 bits of an IPv4 address for the network and leaves 21 bits for hosts. Its subnet mask is 255.224.0.0, and it contains 2²¹ = 2,097,152 addresses, of which 2,097,150 can be assigned to devices. Typical use: A quarter of a /8 (two /12s); sometimes reserved per region or per cloud provider inside 10.0.0.0/8. Use the subnet calculator above to check any /11 network.
/11 subnet example
For 10.0.0.0/11: network address 10.0.0.0, usable hosts 10.0.0.1 – 10.31.255.254, broadcast address 10.31.255.255, wildcard mask 0.31.255.255.
Frequently asked questions
How many usable IPs are in a /11?
2,097,150. The block has 2,097,152 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /11?
255.224.0.0, or 11111111.11100000.00000000.00000000 in binary.
How many /11 subnets are in a /8?
8 (2³), because a /11 uses 3 more network bits than a /8.
What is the difference between /11 and /10?
A /10 (255.192.0.0) is twice as large: 4,194,304 addresses and 4,194,302 usable hosts, spanning two consecutive /11 blocks such as 10.0.0.0–10.63.255.255.