/8 subnet
Mask 255.0.0.0 · 16,777,214 usable hosts · 16,777,216 addresses
| Subnet mask | 255.0.0.0 |
|---|---|
| Wildcard mask | 0.255.255.255 |
| Binary mask | 11111111.00000000.00000000.00000000 |
| Network / host bits | 8 / 24 |
| Total addresses | 16,777,216 |
| Usable hosts | 16,777,214 |
| Per /8 · /16 · /24 | 1 · – · – |
| Example | 192.168.10.77/8 → network 192.0.0.0, hosts 192.0.0.1 – 192.255.255.254, broadcast 192.255.255.255 |
Where /8 is used
The whole 10.0.0.0/8 private range; old class A allocations.
Block boundaries: a /8 must start at a multiple of 16,777,216 addresses. Calculate any specific address in the subnet calculator.
Neighbouring prefixes
Questions
How many hosts in a /8?
16,777,216 addresses, of which 16,777,214 are usable (the first is the network address and the last is broadcast).
What is the subnet mask for /8?
255.0.0.0. In binary: 11111111.00000000.00000000.00000000. The wildcard (inverse) mask is 0.255.255.255.