IPv4 Subnet Calculator
Calculate subnet metrics (network address, broadcast, mask, and host capacity) from CIDR IP addresses.
IPv4 CIDR Settings
Subnet Calculations
Subnet Mask
Wildcard Mask
Network Address
Broadcast Address
First Usable IP
Last Usable IP
Usable Hosts count0
Frequently Asked Questions
What is CIDR notation?
Classless Inter-Domain Routing (CIDR) represents IP addresses and their associated routing prefixes with a suffix, e.g. `/24` representing a netmask of `255.255.255.0`.
Is this calculation private?
Yes, it runs 100% locally in your browser using standard binary arithmetic.