IPv4 Subnet Calculator
Network address, broadcast, host range, wildcard mask and binary breakdown for any IPv4 CIDR block.
Results for 192.0.0.0/3
192.0.0.0/3 is the network in CIDR notation · Reserved (TEST-NET-1 gateway?) (RFC 5737)
- Network address
- 192.0.0.0
- Broadcast address
- 223.255.255.255
- Subnet mask
- 224.0.0.0
- Wildcard mask
- 31.255.255.255
- Total addresses
- 536,870,912
- Usable hosts
- 536,870,910 (excludes network & broadcast)
- First usable host
- 192.0.0.1
- Last usable host
- 223.255.255.254
- CIDR notation
- 192.0.0.0/3
- IP type
- Reserved (TEST-NET-1 gateway?) (RFC 5737)
How the bits line up
| Octets (binary) | ||||
|---|---|---|---|---|
| IP address | 11000000 | 00000000 | 00000000 | 00000000 |
| Subnet mask | 11100000 | 00000000 | 00000000 | 00000000 |
| Network | 11000000 | 00000000 | 00000000 | 00000000 |
| Broadcast | 11011111 | 11111111 | 11111111 | 11111111 |
The mask's 3 leading ones select the network portion; the remaining 29 bits are available for hosts.
Keep exploring
See every fact about the /3 subnet mask, plan multiple subnets with the VLSM calculator, or convert ranges on the range-to-CIDR tool.