Instant calculation

Tools

All tools run entirely in your browser with JavaScript. No data you enter is sent to any server.

Enter an IP and CIDR prefix and get network, mask, broadcast and host range.

Analyze any CIDR block: wildcard mask, total addresses and usable range.

Convert between symbolic notation (rwxr-xr-x) and octal (755) in both directions.

Convert numbers between decimal and binary, with validation.