IPv4 Subnet Calculator
Network address, broadcast, host range, wildcard mask and binary breakdown for any IPv4 CIDR block.
Results for 198.51.100.16/28
198.51.100.16/28 is the network in CIDR notation · Documentation (TEST-NET-2) (RFC 5737)
- Network address
- 198.51.100.16
- Broadcast address
- 198.51.100.31
- Subnet mask
- 255.255.255.240
- Wildcard mask
- 0.0.0.15
- Total addresses
- 16
- Usable hosts
- 14 (excludes network & broadcast)
- First usable host
- 198.51.100.17
- Last usable host
- 198.51.100.30
- CIDR notation
- 198.51.100.16/28
- IP type
- Documentation (TEST-NET-2) (RFC 5737)
How the bits line up
| Octets (binary) | ||||
|---|---|---|---|---|
| IP address | 11000110 | 00110011 | 01100100 | 00010000 |
| Subnet mask | 11111111 | 11111111 | 11111111 | 11110000 |
| Network | 11000110 | 00110011 | 01100100 | 00010000 |
| Broadcast | 11000110 | 00110011 | 01100100 | 00011111 |
The mask's 28 leading ones select the network portion; the remaining 4 bits are available for hosts.
Keep exploring
See every fact about the /28 subnet mask, plan multiple subnets with the VLSM calculator, or convert ranges on the range-to-CIDR tool.