FREE NETWORK TOOL
IPv4 subnet calculator
Enter an IPv4 address with a CIDR prefix to calculate its subnet mask, network and broadcast addresses, usable host range and address capacity.
192.168.1.0/24
- Subnet mask
- 255.255.255.0
- Wildcard mask
- 0.0.0.255
- Network address
- 192.168.1.0
- Broadcast address
- 192.168.1.255
- First usable address
- 192.168.1.1
- Last usable address
- 192.168.1.254
- Total addresses
- 256
- Usable addresses
- 254
What CIDR notation means
The number after the slash shows how many leading bits identify the network. A /24 leaves eight host bits and contains 256 total IPv4 addresses. A shorter prefix creates a larger network.
Network and broadcast addresses
The network address is the first address in a traditional IPv4 subnet, while the broadcast address is the last. For prefixes up to /30, those two addresses are normally excluded from the usable host count.
Special /31 and /32 networks
A /31 contains two addresses and is commonly used on point-to-point links. A /32 represents one host route. The calculator reports both addresses in a /31 as usable and the single /32 address as its own range.