IP Address Converter

This free IP address converter turns an IPv4 address between its familiar dotted-decimal form and its 32-bit integer, hexadecimal (both0x and dotted), octal (integer and dotted), binary and IPv4-mapped IPv6 notation. It also derives the reverse-DNS (in-addr.arpa PTR) name so you can build rDNS zones directly. Integer and hex forms are handy for databases, access lists and low-level networking; the decimal form is what a browser resolves when you paste something like http://3232235777.

Every conversion runs instantly in your browser. The address details panel classifies the address (Class A–E, its default classful subnet mask, and whether it is private, loopback, link-local, CGNAT, multicast, reserved, documentation or public per the IANA special registries). The reverse box accepts any of those numeric formats, so you can paste a decimal, 0x hex,0o octal or 0bbinary value and get the dotted address back. The batch tool converts a whole list at once and exports it as copy-ready CSV.