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Utilities
IPv4 Subnet Calculator
Enter an IP address with a prefix or mask to get the network, broadcast, host range and more.
- Runs in your browser
- Instant results
- Free, no sign-up
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How to use the Subnet Calculator
- Enter an address like 192.168.1.10/24, or an address and subnet mask.
- Read the network details and the binary view.
- Pick a longer prefix to split the network into smaller subnets.
Frequently asked questions
How many hosts does a /24 have?
256 addresses, of which 254 are usable. The network and broadcast addresses cannot be assigned to hosts.
What is a wildcard mask?
The inverse of the subnet mask, used in Cisco ACLs and OSPF. For 255.255.255.0 it is 0.0.0.255.
What about /31 and /32?
A /31 has two usable addresses for point-to-point links, and a /32 is a single host.
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