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Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › [Snap] Strange hostname format on static IPs
nate

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#31191 8-Mar-2009 13:43
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Does anyone know why Snap puts their IP addresses backwards on the associated hostname, for example:

123.255.41.10 becomes 10.41.255.123.static.snap.net.nz, whereas most (if not all) of the other ISPs would do this: 123-255-41-10.static.snap.net.nz.

Anyone think of a rhyme or reason for this?

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kingjj
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  #199978 8-Mar-2009 21:59
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Its called rDNS: 
Reverse DNS lookups for IPv4 addresses use a reverse IN-ADDR entry in the special domain in-addr.arpa. In the in-addr.arpa domain a sequence of bytes in reverse order represent an IPv4 address, encoded as decimal numbers, separated by dots with the suffix .in-addr.arpa. For example, the reverse lookup domain name corresponding to the IPv4 address 10.12.13.140 is 140.13.12.10.in-addr.arpa. A host name for 1.2.3.4 can be obtained by issuing a DNS query for the PTR record for that special address 4.3.2.1.in-addr.arpa.

http://en.wikipedia.org/wiki/RDNS

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