IP to Hex Converter

IPv4 addresses often turn up in hexadecimal — in packet dumps, in Linux /proc/net/tcp, in C code as 0xC0A80101 and in some obfuscated URLs. This converter writes an address as hex in the common styles (plain, 0x-prefixed, dotted and little-endian) and reads hex back into a normal address. IPv6 addresses are expanded to their full 32 hex digits.

How to use this tool

1. Enter an IP address, or a hex value such as C0A80101, 0xC0A80101 or C0.A8.01.01.
2. Tick little-endian if the hex came from x86 memory or /proc/net/tcp, where the bytes are reversed.
3. Paste several lines to convert a list at once.

Formula

hex = hex(a) ‖ hex(b) ‖ hex(c) ‖ hex(d), each octet written as 2 digits

Each decimal octet from 0 to 255 becomes exactly two hex digits, 00 to FF: the first digit is the octet divided by 16, the second is the remainder. Network byte order is big-endian (first octet first); little-endian simply reverses the four bytes. Leading-zero IPv4 octets are read as decimal. Paired IPv6 brackets are accepted; zone identifiers must be removed explicitly. Digit-only dotted input is decimal; use a full 0x prefix to disambiguate hexadecimal.

Example

For 192.168.1.1: 192 = 12 × 16 + 0 → C0, 168 = 10 × 16 + 8 → A8, and 1 → 01 twice. The result is C0A80101 (0xC0A80101, dotted C0.A8.01.01). In little-endian order the bytes reverse to 0101A8C0 — which is why /proc/net/tcp shows 127.0.0.1 as 0100007F.