Decimal to IP Converter Online – Integer to IPv4 Address

How to use the Decimal to IP Converter

Type or paste a whole number from 0 to 4294967295 into the address field, without commas or spaces.

Read the Dotted decimal row, which updates as you type.

If a value is negative, add 4294967296 to it before converting.

Copy the decoded address with the button on its row.

Decimal to IP: turn an integer back into an address

Databases, analytics exports and IP-range datasets often store an IPv4 address as a plain number such as 3232235777. A decimal to IP conversion splits that number back into four octets so you can read it, ping it or paste it into a firewall rule.

Decoding by repeated division

Divide by the place values of base 256 and keep the remainders:

3232235777 ÷ 16,777,216 = 192   remainder 11,010,305
  11010305 ÷     65,536 = 168   remainder 257
       257 ÷        256 =   1   remainder 1
                                last octet = 1
→ 192.168.1.1

Programmers usually do the same thing with bit shifts. In JavaScript, [n >>> 24, (n >>> 16) & 255, (n >>> 8) & 255, n & 255].join('.') produces the dotted form: shift the wanted byte to the bottom, then mask off everything above it.

Examples

2130706433   →  127.0.0.1
167772414    →  10.0.0.254
16777216     →  1.0.0.0
0            →  0.0.0.0
4294967295   →  255.255.255.255

The value 16777216 is exactly 256³, which is why it decodes to 1.0.0.0: each step of 256³ moves the first octet by one.

Integer addresses are common in IP-to-location tables and log pipelines, which key each row by a start and end number so that a lookup is a single numeric comparison. Decoding a few rows by hand is a quick way to confirm you are reading the right columns.

Input rules and common errors

Only digits. Thousands separators such as 3,232,235,777 are rejected; remove them first.
Range 0–4294967295. Anything larger needs more than 32 bits and cannot be an IPv4 address.
Negative numbers. A value like -1062731519 comes from storing the address in a signed 32-bit field. Add 4,294,967,296 and you get 3232235777, which is 192.168.1.1.
Byte order. If a result looks reversed (for example 1.1.168.192), the number was built from little-endian bytes. Converting it to hex with Decimal to Hex makes the byte order easy to spot.

Decimal IP addresses in databases, code and URLs

You rarely need to decode integers by hand, because most platforms have a built-in function. These are handy when you move from a quick check here to a query or a script:

MySQL: INET_NTOA(3232235777) returns '192.168.1.1', and INET_ATON() goes back.
PostgreSQL: '0.0.0.0'::inet + 3232235777 gives 192.168.1.1.
Python: str(ipaddress.IPv4Address(3232235777)).

Browsers accept the same trick: the URL parser reads a host written as a single number, so http://2130706433/ opens 127.0.0.1. Phishing links sometimes use this form to hide where they point. If you see a long number where a domain should be, decode it here to find the real address before you click.

Related tools

Going the other way is handled by IP to Decimal. If your data stores ranges as a start and end integer, decode both ends here and then check the block with the CIDR calculator. All conversions run locally in your browser.

Frequently asked questions

How do I convert 3232235777 to an IP address?

Divide by 16,777,216 to get the first octet (192), then divide the remainder by 65,536 (168), then by 256 (1), and the final remainder is the last octet (1). The address is 192.168.1.1.

Why does the converter reject my number?

It must be a whole number between 0 and 4294967295 written with digits only. Commas, decimal points, minus signs and values above 2³² − 1 are not valid 32-bit IPv4 values.

How do I convert a negative IP integer?

Add 4294967296 to it. A negative value means the address was stored in a signed 32-bit integer, and adding 2³² restores the unsigned number.

What IP address is 0?

The integer 0 is 0.0.0.0, which software uses to mean "any address" or "no address", depending on context.