IP Subnet Calculator
Calculate subnet details from any IP and CIDR: network, broadcast, mask, host range and usable hosts. Free IPv4 tool.
Accepts /24 notation or a dotted netmask like 255.255.255.0. IPv4 only.
Frequently asked questions
- What can I enter here?
- Any IPv4 address with either CIDR notation like 192.168.1.100/24 or a dotted netmask like 255.255.255.0.
- What does the calculator output?
- Netmask, wildcard mask, network and broadcast addresses, usable host range, host count, address class and binary forms.
- Does it support IPv6?
- No, this tool is IPv4 only. IPv6 subnetting works differently and is not covered here.
- Is the calculation done locally?
- Yes, everything runs in your browser. No IP addresses are logged or transmitted.
This tool runs entirely in your browser. No data is uploaded anywhere.