A /11 subnet mask is 255.224.0.0, with 2,097,152 addresses and 2,097,150 usable hosts.
| CIDR prefix | /11 |
|---|---|
| Subnet mask | 255.224.0.0 |
| Subnet mask (binary) | 11111111.11100000.00000000.00000000 |
| Wildcard mask | 0.31.255.255 |
| Network bits / host bits | 11 / 21 |
| Total addresses | 2,097,152 |
| Usable hosts | 2,097,150 |
| /11 subnets in a /8 | 8 |
The mask ends 3 bits into octet 2, so blocks step in increments of 32 in that octet.
| Network | First usable host | Last usable host | Broadcast |
|---|---|---|---|
| 10.0.0.0/11 | 10.0.0.1 | 10.31.255.254 | 10.31.255.255 |
| 10.32.0.0/11 | 10.32.0.1 | 10.63.255.254 | 10.63.255.255 |
| 10.64.0.0/11 | 10.64.0.1 | 10.95.255.254 | 10.95.255.255 |
| 10.96.0.0/11 | 10.96.0.1 | 10.127.255.254 | 10.127.255.255 |
| 10.128.0.0/11 | 10.128.0.1 | 10.159.255.254 | 10.159.255.255 |
| 10.160.0.0/11 | 10.160.0.1 | 10.191.255.254 | 10.191.255.255 |
| 10.192.0.0/11 | 10.192.0.1 | 10.223.255.254 | 10.223.255.255 |
| 10.224.0.0/11 | 10.224.0.1 | 10.255.255.254 | 10.255.255.255 |
A /11 subnet mask is 255.224.0.0. In binary that is 11111111.11100000.00000000.00000000: 11 network bits followed by 21 host bits. The wildcard mask is 0.31.255.255.
A /11 holds 2,097,152 addresses in total. Subtracting the network and broadcast addresses leaves 2,097,150 usable hosts.
A /8 divides into 8 subnets of size /11, because each extra mask bit doubles the number of subnets.
Calculate this over HTTP: curl https://networkcalc.com/api/ip/192.168.1.0/11.
See the Subnet Calculator API.