Out-of-range value
Values above 2^32 - 1 cannot represent an IPv4 address.
Fix: Double-check the number; you might be dealing with an IPv6 address instead.
Decimal to IP Converter
Convert a 32-bit unsigned decimal value back into a standard dotted-quad IPv4 address.
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What is Decimal to IP Converter
Written by Giorgos Kostas. Last reviewed:
Decimal to IP Converter accepts a 32-bit unsigned integer in the range 0–4,294,967,295 and splits it into the four 8-bit octets that form a standard IPv4 address.
It is the mirror of IP to Decimal and is useful when reading logs, database rows, or firewall rules that store IPs as plain integers instead of dotted-quad text.
Why use it
- Read IPs out of MySQL columns stored with INET_ATON.
- Translate integer entries in firewall or proxy logs to human form.
- Inspect geo-IP ranges whose boundaries are stored as integers.
- Convert IP integers emitted by microservices or embedded devices.
- Learn the arithmetic behind IPv4 packing.
Features
- Instant integer-to-IPv4 conversion
- Matches MySQL INET_NTOA output
- Validates the decimal range before converting
- Runs client-side with no upload
- Copy-ready dotted-quad output
How to use Decimal to IP Converter
- Paste the decimal. Drop the 32-bit unsigned integer into the input panel.
- Read the IPv4. The dotted-quad form appears in the output.
- Copy the address. Copy the human-readable IPv4 into your log or report.
Example (before/after)
32-bit decimal
3232235521
IPv4 dotted-quad
192.168.0.1
Common errors
Negative integers
Signed representations can appear negative if the MSB is set.
Fix: Add 2^32 to the negative value to get the equivalent unsigned decimal before converting.
Hex disguised as decimal
A value starting with 0x is hex, not decimal.
Fix: Use a hex-to-IP converter for hex-formatted IPv4 integers.
FAQ
What is the valid range?
0 to 4,294,967,295 (2^32 - 1).
Does it match INET_NTOA?
Yes. The output equals `SELECT INET_NTOA(...)`.
Why is my output 0.0.0.0?
You probably entered 0 or an empty string.
Does it support IPv6?
No. IPv6 values are 128 bits and do not fit in a 32-bit decimal.
Is this done in the browser?
Yes. The conversion runs client-side.
What if I paste a negative integer?
Convert it to unsigned by adding 2^32 first.
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