Skip to main content Logo (IEC resistor symbol) logo

Quis custodiet ipsos custodes?
Home | About | All pages | RSS Feed | Gopher

IPv4 Address Conversion Tricks

Published: 01-09-2013 | Author: Remy van Elst | Text only version of this article

Table of Contents


Did you know that http://3515693643/ is a valid link? Why? Because this is the decimal form of the binary IP address. Normally we represent IP addresses as, 4 blocks of numbers. Those numbers are actually binary octets represented in decimal, therefore they can never be more than 255. If we take the whole binary number of all blocks, and convert that to base 10, we get a result like above, which in turn is a working network address.

If you like this article, consider sponsoring me by trying out a Digital Ocean VPS. With this link you'll get $100 credit for 60 days). (referral link)

This "feature" is documented in the inet_aton(3) manpage.

I've written a little javascript based converter so you can try it out yourself.


Take the IP address As a binary octets that would be: 1101000.11000110.10011101.001001011. That whole number (without the dots), converted back to decimal in turn is: 3515693643.

And, that is a working network address:

$  ping 3515693643
PING 3515693643 ( 56 data bytes
64 bytes from icmp_seq=0 ttl=47 time=180.208 ms
64 bytes from icmp_seq=1 ttl=47 time=197.890 ms

Example Converter


Go to the converter

Tags: articles , binary , decimal , ip , ipv4 , math , network , octal