IPv4 Subnet Calculator
Network address, broadcast, host range, wildcard mask and binary breakdown for any IPv4 CIDR block.
Results for 198.51.0.0/17
198.51.0.0/17 is the network in CIDR notation · Public
- Network address
- 198.51.0.0
- Broadcast address
- 198.51.127.255
- Subnet mask
- 255.255.128.0
- Wildcard mask
- 0.0.127.255
- Total addresses
- 32,768
- Usable hosts
- 32,766 (excludes network & broadcast)
- First usable host
- 198.51.0.1
- Last usable host
- 198.51.127.254
- CIDR notation
- 198.51.0.0/17
- IP type
- Public
How the bits line up
| Octets (binary) | ||||
|---|---|---|---|---|
| IP address | 11000110 | 00110011 | 00000000 | 00000000 |
| Subnet mask | 11111111 | 11111111 | 10000000 | 00000000 |
| Network | 11000110 | 00110011 | 00000000 | 00000000 |
| Broadcast | 11000110 | 00110011 | 01111111 | 11111111 |
The mask's 17 leading ones select the network portion; the remaining 15 bits are available for hosts.
Keep exploring
See every fact about the /17 subnet mask, plan multiple subnets with the VLSM calculator, or convert ranges on the range-to-CIDR tool.