Enter an IPv4 address and CIDR prefix to see network, broadcast, host range, and masks.
Type a full CIDR like 192.168.1.0/24 into the top box, or use the separate IP and CIDR fields below it. Click Calculate to see the network address, broadcast, first and last usable host, total and usable host counts, mask, wildcard, binary mask, and address class. The /31 and /32 prefixes show zero usable hosts since they have no separate host range.