SUBNET SENSEI

IPv4 CIDR & Subnet Calculator

IPv4 only. Traditional usable-host counts are used for /0–/30. A /31 is treated as an RFC 3021 point-to-point link with two usable endpoints and no directed broadcast; /32 is treated as a one-address host route.

You can enter any address inside the subnet; the calculator normalizes it to the network prefix.