/12 Subnet Mask Reference (255.240.0.0)
Custom CIDR block with 1,048,576 total IPv4 addresses (1,048,574 usable host IPs) for VLSM allocation.
| CIDR Prefix | /12 |
|---|---|
| Subnet Mask | 255.240.0.0 |
| Wildcard Mask (Cisco / ACL) | 0.15.255.255 |
| Total IPv4 Addresses | 1,048,576 |
| Usable Host IPs | 1,048,574 |
| Binary Subnet Mask | 11111111.11110000.00000000.00000000 |
| Example Block (10.0.0.0/12) | 10.0.0.0 – 10.15.255.255 |
| Example Usable Hosts | 10.0.0.1 – 10.15.255.254 |
Need to compute custom IP ranges? Try the Interactive Subnet Calculator or VLSM Splitter.