/18 subnet
Mask 255.255.192.0 · 16,382 usable hosts · 16,384 addresses
| Subnet mask | 255.255.192.0 |
|---|---|
| Wildcard mask | 0.0.63.255 |
| Binary mask | 11111111.11111111.11000000.00000000 |
| Network / host bits | 18 / 14 |
| Total addresses | 16,384 |
| Usable hosts | 16,382 |
| Per /8 · /16 · /24 | 1,024 · 4 · – |
| Example | 192.168.10.77/18 → network 192.168.0.0, hosts 192.168.0.1 – 192.168.63.254, broadcast 192.168.63.255 |
Where /18 is used
A /18 is a less common size; it sits between /17 (32,768 addresses) and /19 (8,192 addresses).
Block boundaries: a /18 must start at a multiple of 16,384 addresses. Calculate any specific address in the subnet calculator.
Neighbouring prefixes
Questions
How many hosts in a /18?
16,384 addresses, of which 16,382 are usable (the first is the network address and the last is broadcast).
What is the subnet mask for /18?
255.255.192.0. In binary: 11111111.11111111.11000000.00000000. The wildcard (inverse) mask is 0.0.63.255.