IPv4 Address Conversion Tricks
Published: 01-09-2013 | Author: Remy van Elst | Text only version of this article
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Did you know that
http://3515693643/ is a valid link? Why? Because this is thedecimal form of the binary IP address. Normally we represent IP addresses as10.0.0.1, 4 blocks of numbers. Those numbers are actually binary octetsrepresented in decimal, therefore they can never be more than 255. If we takethe whole binary number of all blocks, and convert that to base 10, we get aresult like above, which in turn is a working network address.
This "feature" is documented in the inet_aton(3) manpage.
Take the IP address
220.127.116.11. As a binary octets that would be:
1101000.11000110.10011101.001001011. That whole number (without the dots),converted back to decimal in turn is:
And, that is a working network address:
$ ping 3515693643PING 3515693643 (18.104.22.168): 56 data bytes64 bytes from 22.214.171.124: icmp_seq=0 ttl=47 time=180.208 ms64 bytes from 126.96.36.199: icmp_seq=1 ttl=47 time=197.890 ms