Octal to IP Converter
Convert octal values to IPv4 addresses and IP addresses to octal.
Octal to IP Converter
Convert IPv4 addresses written in octal into normal dotted-decimal notation, and convert IP addresses to octal. Paste one value per line: 0300.0250.0000.0001 becomes 192.168.0.1, 0177.0.0.01 becomes 127.0.0.1, and the single octal number 030052000001 is also 192.168.0.1.
Octal IP notation explained
The classic BSD inet_aton() function – still used by ping, curl, many browsers, and C libraries – accepts each part of an IPv4 address in decimal, hexadecimal, or octal. A part that starts with 0 is read as octal. So 0300 means 3 × 64 + 0 × 8 + 0 = 192 and 0250 means 2 × 64 + 5 × 8 + 0 = 168.
Each octet is between 0 and 0377 in octal (255 decimal). The whole 32-bit address can also be written as one octal number between 0 and 037777777777.
| Decimal | 192 | 168 | 0 | 1 |
|---|---|---|---|---|
| Octal | 0300 | 0250 | 0000 | 0001 |
Why octal IP addresses matter
- Security and phishing – attackers use octal, hex, and integer notations to disguise addresses in URLs and bypass naive filters.
http://0177.0.0.1/points to localhost; converting it reveals the real destination. - SSRF testing – penetration testers check whether a server-side URL filter blocks alternative notations of internal addresses such as
0177.0.0.1or012.0.0.1(10.0.0.1). - Leading-zero bugs – configuration files that pad addresses with zeros (
010.001.001.010) may be read as octal by some software, silently turning 010 into 8. Converting helps you spot the problem.
Options
In IP-to-octal mode, keep Dotted octets on for 0300.0250.0000.0001, or turn it off for one number (030052000001). Leading 0 (C style) adds the 0 marker that tells parsers the value is octal; turn it off for plain base-8 digits (300.250.0.1). When converting octal to IP, octets may be written with or without leading zeros.
Related tools: Hex to IP, Decimal to IP, and the general Octal to Decimal converter.
Frequently Asked Questions
What is 127.0.0.1 in octal?
0177.0000.0000.0001, usually shortened to 0177.0.0.1. As a single number it is 017700000001.
Why does 010.0.0.1 open 8.0.0.1?
Many network libraries treat an octet with a leading zero as octal, and 010 in octal is 8. Remove leading zeros from IP addresses in configuration files to avoid this.
Can I convert an octal IP without dots?
Yes. A single octal number up to 037777777777 is converted to the corresponding 32-bit IPv4 address.