About IPTools

IPTools is a free, browser-based collection of IP address and networking utilities for network engineers, sysadmins, and developers. All calculations happen locally — no data is ever sent to our servers.

Our Tools

• IP Converter — Convert IPv4 addresses between dotted-decimal, decimal integer, hex, and binary
• CIDR Calculator — Get full subnet details from CIDR notation, including host range and split
• Subnet Mask Calculator — Convert prefix ↔ mask, find prefix for a host count, full cheat sheet
• Port Lookup — Search TCP/UDP port numbers and service names

Privacy First

Your IP addresses and network data never leave your browser. All calculations are pure client-side JavaScript.

Related Tools

• net-tools.vip — Encoders, decoders, generators
• cron.net-tools.vip — Cron expression tools