/9 Subnet Mask Reference (255.128.0.0)
Custom CIDR block with 8,388,608 total IPv4 addresses (8,388,606 usable host IPs) for VLSM allocation.
| CIDR Prefix | /9 |
|---|---|
| Subnet Mask | 255.128.0.0 |
| Wildcard Mask (Cisco / ACL) | 0.127.255.255 |
| Total IPv4 Addresses | 8,388,608 |
| Usable Host IPs | 8,388,606 |
| Binary Subnet Mask | 11111111.10000000.00000000.00000000 |
| Example Block (10.0.0.0/9) | 10.0.0.0 – 10.127.255.255 |
| Example Usable Hosts | 10.0.0.1 – 10.127.255.254 |
Need to compute custom IP ranges? Try the Interactive Subnet Calculator or VLSM Splitter.