Calculate network address, broadcast, usable host ranges, and binary masks.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Input your target IPv4 address.
Choose your subnet CIDR prefix (e.g. /24, /16, /28).
View network address, broadcast address, and copy host specs.
The network address is the first address in a subnet identifying the network itself, while the broadcast address is the last address used to communicate with all hosts.
Zero-egress companion tools in the Developer Tools suite
Format, validate, repair, and minify JSON data instantly.
Decode, verify claims, inspect headers, and check token expiry.
Test regex patterns with flags, group captures, and live matches.
Compare text or source code side-by-side with visual diffs.
