/16 subnet
Mask 255.255.0.0 · 65,534 usable hosts · 65,536 addresses
| Subnet mask | 255.255.0.0 |
|---|---|
| Wildcard mask | 0.0.255.255 |
| Binary mask | 11111111.11111111.00000000.00000000 |
| Network / host bits | 16 / 16 |
| Total addresses | 65,536 |
| Usable hosts | 65,534 |
| Per /8 · /16 · /24 | 256 · 1 · – |
| Example | 192.168.10.77/16 → network 192.168.0.0, hosts 192.168.0.1 – 192.168.255.254, broadcast 192.168.255.255 |
Where /16 is used
The 192.168.0.0/16 private range; a typical AWS VPC.
Block boundaries: a /16 must start at a multiple of 65,536 addresses. Calculate any specific address in the subnet calculator.
Neighbouring prefixes
Questions
How many hosts in a /16?
65,536 addresses, of which 65,534 are usable (the first is the network address and the last is broadcast).
What is the subnet mask for /16?
255.255.0.0. In binary: 11111111.11111111.00000000.00000000. The wildcard (inverse) mask is 0.0.255.255.