CIDR and IP subnet calculator


ExplainerHow-to
CIDR, the netmask and the router's longest match
Prefix lengths, longest-prefix match, subnet and broadcast arithmetic, why /31 and /32 are special, and the planning mistakes that bite later.
ExplainerHow-to
Prefix lengths, longest-prefix match, subnet and broadcast arithmetic, why /31 and /32 are special, and the planning mistakes that bite later.