About
Inspect IPv4 subnet boundaries, masks, and host capacity from CIDR notation.
What this calculates
Given an IPv4 address and prefix, the calculator returns subnet mask, wildcard mask, network address, broadcast address, host range, and host counts.
Why CIDR matters
CIDR prefixes define how much of an address is network versus host bits, which directly controls routing boundaries and available host space.
Use cases
Useful for firewall rules, cloud VPC planning, static route setup, lab exercises, and troubleshooting overlap between private network segments.