What is a /28 subnet?
14 usable hosts out of 16 addresses, behind netmask 255.255.255.240.
| Prefix | /28 |
|---|---|
| Netmask | 255.255.255.240 |
| Wildcard | 0.0.0.15 |
| Total addresses | 16 |
| Usable hosts | 14 |
| Example block | 10.0.0.0/28 |
| Usable host range | 10.0.0.1 – 10.0.0.14 |
| Broadcast | 10.0.0.15 |
A /28 fixes the first 28 bits of the address as the network and leaves 4 for hosts — 16 addresses in all.
Of those, 14 can be given to a machine: the first address names the network itself, and the last is the broadcast address.
Small enough to count on your fingers: a handful of servers, a load-balancer pool, or the linking network between two devices.
16 of them fit inside a /24.
Other subnet sizes
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