Purpose
Calculate netmask, network, broadcast, and usable ranges from an IPv4 address and prefix.
How it works
A CIDR prefix fixes the leftmost IPv4 network bits; bit masks derive the canonical network and host range, with separate /31 and /32 semantics.
Input
Enter text, numbers, a file, or a query target as required. Start with the page example to confirm the format, then replace it with your data.
Interpreting output
Confirm output format, units, and status, then compare with the input and target environment; successful formatting does not prove validity.
Limitations and privacy
This tool contacts the DEA server or an external data source; do not submit confidential data.