CIDR / Subnet Calculator
Enter an IPv4 address and prefix length to get the full subnet breakdown.
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How this works
A CIDR block like 192.168.1.10/24 combines an IP address with a prefix length that defines the subnet mask. This tool computes the network address, broadcast address, usable host range, and total/usable host counts entirely in your browser.
Frequently asked questions
What does the /24 in an IP/CIDR mean?
It's the prefix length — the number of bits used for the network portion of the address. /24 means a 255.255.255.0 subnet mask, leaving 8 bits (256 addresses) for hosts.
Why are usable hosts 2 less than total addresses?
The first address in a subnet is reserved as the network address and the last as the broadcast address, so neither can be assigned to a host (except in /31 and /32 subnets).