🌐 Subnet Calculator
Calculate the network, broadcast, host range, and mask for any IPv4 subnet.
Network Address192.168.1.0
Broadcast Address192.168.1.255
Usable Host Range192.168.1.1 – 192.168.1.254
Usable Hosts254
Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255
CIDR Notation192.168.1.0/24
IP Class / ScopeC · Private
What is a subnet calculator?
A subnet calculator takes an IPv4 address and a CIDR prefix (like /24) and works out everything that follows from it: the network address, the broadcast address, the range of usable host addresses, how many hosts the subnet can hold, and the subnet and wildcard masks. It saves you from doing binary math by hand every time you plan or troubleshoot a network.
How to use it
- Type an IPv4 address (for example
192.168.1.10). - Choose the CIDR prefix from
/0to/32. - Read off the network, broadcast, host range, and masks instantly — all calculated in your browser.
Quick reference
- Network address — the first address in the block; identifies the subnet itself.
- Broadcast address — the last address; used to reach every host in the subnet.
- Usable hosts — total addresses minus the network and broadcast (except
/31and/32, which are special cases). - Wildcard mask — the inverse of the subnet mask, used in tools like access control lists.
Want to go deeper? Read our guides on ports and protocols and how NAT works.