This is a text-only version of the following page on https://raymii.org: --- Title : IPv4 Address Conversion Tricks Author : Remy van Elst Date : 01-09-2013 URL : https://raymii.org/s/articles/IPv4_Address_Conversion_Tricks.html Format : Markdown/HTML --- ### Theory 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 10.0.0.1, 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.

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This "feature" is documented in the [inet_aton(3)][2] manpage. I've written a little javascript based converter so you can try it out yourself. ### Example Take the IP address `209.141.58.75`. 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 (209.141.58.75): 56 data bytes 64 bytes from 209.141.58.75: icmp_seq=0 ttl=47 time=180.208 ms 64 bytes from 209.141.58.75: icmp_seq=1 ttl=47 time=197.890 ms ### Example Converter [ ![IP-JS.png][3] ][4] [Go to the converter][4] [1]: https://www.digitalocean.com/?refcode=7435ae6b8212 [2]: http://linux.die.net/man/3/inet_aton [3]: https://raymii.org/s/inc/img/ip-js.png [4]: https://raymii.org/s/inc/software/ip-js.html --- License: All the text on this website is free as in freedom unless stated otherwise. This means you can use it in any way you want, you can copy it, change it the way you like and republish it, as long as you release the (modified) content under the same license to give others the same freedoms you've got and place my name and a link to this site with the article as source. This site uses Google Analytics for statistics and Google Adwords for advertisements. You are tracked and Google knows everything about you. Use an adblocker like ublock-origin if you don't want it. All the code on this website is licensed under the GNU GPL v3 license unless already licensed under a license which does not allows this form of licensing or if another license is stated on that page / in that software: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Just to be clear, the information on this website is for meant for educational purposes and you use it at your own risk. I do not take responsibility if you screw something up. Use common sense, do not 'rm -rf /' as root for example. If you have any questions then do not hesitate to contact me. See https://raymii.org/s/static/About.html for details.