IPv4 address converter

An IPv4 address like 192.168.1.1 is just a human-friendly way of writing a 32-bit number. Databases, firewalls, log files and network code sometimes store or display it in other forms: a single decimal integer, binary, hexadecimal or an IPv6-mapped address. This converter shows all of them at once.

How to use it

1. Enter an IPv4 address in dotted-decimal notation.
2. Read the decimal, binary, hexadecimal and IPv6 representations.
3. Copy the format you need.

Example: 192.168.1.1

• Decimal integer: 192 × 256³ + 168 × 256² + 1 × 256 + 1 = 3232235777
• Binary: 11000000.10101000.00000001.00000001
• Hexadecimal: C0A80101
• IPv4-mapped IPv6: ::ffff:192.168.1.1, also written ::ffff:c0a8:101

Why convert to an integer?

• Range checks: an address is inside a range if its integer lies between the range's start and end integers.
• Storage: an integer takes 4 bytes instead of up to 15 characters. MySQL offers INET_ATON() and INET_NTOA() for this; PostgreSQL has a native inet type.
• Sorting: sorting addresses as text puts 10.0.0.10 before 10.0.0.9; sorting integers gives the right order.

Where the IPv6 form appears

Dual-stack servers that accept IPv4 connections on an IPv6 socket often log clients as ::ffff:203.0.113.5. Strip the prefix to get the plain IPv4 address.

Binary and subnets

The binary form makes subnet masks easy to understand: a /24 network means the first 24 bits are the network part and the last 8 bits identify hosts.