IP Subnet Calculator
Networking
100% in-browser
Enter an IPv4 address and CIDR prefix to get the full subnet breakdown.
How to use the IP Subnet Calculator
- 1 Enter an IPv4 address and choose a CIDR prefix.
- 2 See the netmask, network and broadcast addresses.
- 3 Read the usable host range and total host count.
About the IP Subnet Calculator
Subnetting splits an IP network into smaller ranges. Given an address and prefix length, this calculator derives the subnet mask, network and broadcast addresses, the first and last usable hosts and how many hosts the subnet holds.
All arithmetic runs in your browser.
Frequently asked questions
Does it support IPv6?
This tool covers IPv4 subnetting; IPv6 uses a different, much larger address space.
What is the broadcast address?
The last address in the subnet, used to reach all hosts on it.
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