/2 subnet
Mask 192.0.0.0 · 1,073,741,822 usable hosts · 1,073,741,824 addresses
| Subnet mask | 192.0.0.0 |
|---|---|
| Wildcard mask | 63.255.255.255 |
| Binary mask | 11000000.00000000.00000000.00000000 |
| Network / host bits | 2 / 30 |
| Total addresses | 1,073,741,824 |
| Usable hosts | 1,073,741,822 |
| Example | 192.168.10.77/2 → network 192.0.0.0, hosts 192.0.0.1 – 255.255.255.254, broadcast 255.255.255.255 |
Where /2 is used
A /2 is a less common size; it sits between /1 (2,147,483,648 addresses) and /3 (536,870,912 addresses).
Block boundaries: a /2 must start at a multiple of 1,073,741,824 addresses. Calculate any specific address in the subnet calculator.
Neighbouring prefixes
Questions
How many hosts in a /2?
1,073,741,824 addresses, of which 1,073,741,822 are usable (the first is the network address and the last is broadcast).
What is the subnet mask for /2?
192.0.0.0. In binary: 11000000.00000000.00000000.00000000. The wildcard (inverse) mask is 63.255.255.255.