/17 Subnet Mask Reference (255.255.128.0)
Custom CIDR block with 32,768 total IPv4 addresses (32,766 usable host IPs) for VLSM allocation.
| CIDR Prefix | /17 |
|---|---|
| Subnet Mask | 255.255.128.0 |
| Wildcard Mask (Cisco / ACL) | 0.0.127.255 |
| Total IPv4 Addresses | 32,768 |
| Usable Host IPs | 32,766 |
| Binary Subnet Mask | 11111111.11111111.10000000.00000000 |
| Example Block (10.0.0.0/17) | 10.0.0.0 – 10.0.127.255 |
| Example Usable Hosts | 10.0.0.1 – 10.0.127.254 |
Need to compute custom IP ranges? Try the Interactive Subnet Calculator or VLSM Splitter.