What is a /11 subnet?
2,097,150 usable hosts out of 2,097,152 addresses, behind netmask 255.224.0.0.
| Prefix | /11 |
|---|---|
| Netmask | 255.224.0.0 |
| Wildcard | 0.31.255.255 |
| Total addresses | 2,097,152 |
| Usable hosts | 2,097,150 |
| Example block | 10.0.0.0/11 |
| Usable host range | 10.0.0.1 – 10.31.255.254 |
| Broadcast | 10.31.255.255 |
A /11 fixes the first 11 bits of the address as the network and leaves 21 for hosts — 2,097,152 addresses in all.
Of those, 2,097,150 can be given to a machine: the first address names the network itself, and the last is the broadcast address.
A block this large is an allocation rather than a subnet — a whole private range to carve up, or something a regional registry hands out. You would not put hosts directly in it.
It is 8,192 times the size of a /24.
Other subnet sizes
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