/12 subnet
A /12 prefix equals subnet mask 255.240.0.0 and wildcard 0.15.255.255. It holds 1,048,576 addresses, 1,048,574 of them usable by hosts.
/12
- Subnet mask
- 255.240.0.0
- Wildcard mask
- 0.15.255.255
- Binary mask
- 11111111.11110000.00000000.00000000
- Total addresses
- 1,048,576
- Usable hosts
- 1,048,574
- Example network
- 10.0.0.0/12
- Example range
- 10.0.0.0 – 10.15.255.255
- How many fit
- 16 × /12 in a /8
The RFC 1918 private range 172.16.0.0/12 is exactly this size.