IP Address Converter

Convert an IP address between dotted decimal, integer, hexadecimal, binary and IPv6 formats, or turn a number back into an IP address.

Try: your IP, 3232235777, 0xC0A80001, 2001:db8::ff00:42:8329

0.0.0.0

IPv4
Standard notation0.0.0.0
Integer (decimal)0
Hexadecimal0x00000000
Binary00000000.00000000.00000000.00000000
Octal (dotted)00.00.00.00
Hex (dotted)00.00.00.00
IPv4-mapped IPv6::ffff:0.0.0.0
IPv4-mapped IPv6 (hex)::ffff:0.0.0.0
6to4 prefix2002:0000:0000::/48
ClassA
Reverse DNS name0.0.0.0.in-addr.arpa
Address typePrivate

Why convert IP addresses?

Computers store an IPv4 address as a single 32-bit number; the familiar dotted form like 192.168.0.1 is just a human-friendly way to write its four bytes. Different tools and databases use different representations:

  • Integer (decimal): compact storage and fast range queries in databases and geolocation files. 192.168.0.1 is 3232235521.
  • Hexadecimal: used in packet captures, kernel tables and some log formats: 0xC0A80001.
  • Binary: essential for understanding subnet masks and CIDR. Every 1 bit in the mask marks the network part.
  • IPv4-mapped IPv6: how dual-stack software represents IPv4 clients, for example ::ffff:192.168.0.1.

How the conversion works

Multiply each octet by its place value and add them up: a × 256³ + b × 256² + c × 256 + d. For 8.8.8.8 that is 8 × 16,777,216 + 8 × 65,536 + 8 × 256 + 8 = 134,744,072. To go back, divide by 256 repeatedly and keep the remainders.

IPv6 compression and expansion

IPv6 addresses can be written in shortened form: leading zeros in each group are dropped and one run of all-zero groups is replaced by ::. The converter shows both the compressed form (2001:db8::1) and the full expanded form (2001:0db8:0000:0000:0000:0000:0000:0001). Learn more about IPv6.

Security note: browsers and many libraries accept unusual IP formats such as http://2130706433/ (which is 127.0.0.1) or octal octets. Attackers use these to bypass naive filters, so always normalise addresses before validating them.

Frequently asked questions

Can I enter binary?

Yes. Enter 32 bits for IPv4 or 128 bits for IPv6, with or without dots.

What is the largest IPv4 number?

4294967295, which is 255.255.255.255 (2³² − 1).

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