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IP Subnet Calculator
IPv4 network, netmask, broadcast, and host count from CIDR.
Free to use — no sign-up or login.
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Network
Subnet mask
Broadcast
Usable hosts
This free IP Subnet Calculator covers IPv4 network, netmask, broadcast, and host count from CIDR.
Enter the IP Subnet Calculator fields, then read the output. Other calculators on this site keep the formula visible beside the form, with no account required.
Using the IP Subnet Calculator
IPv4 network, netmask, broadcast, and host count from CIDR. Typical inputs are IPv4 address and Prefix length (/24). How it works beside the form states the identity the IP Subnet Calculator applies.
FAQ
How do I use the IP Subnet Calculator?
Open the IP Subnet Calculator, fill IPv4 address and Prefix length (/24), and read the result. mask = 1s for the prefix bits; network = addr ∧ mask.
What formula does the IP Subnet Calculator use?
The IP Subnet Calculator uses the identity in How it works. In words: mask = 1s for the prefix bits; network = addr ∧ mask.