[Python-bugs-list] [ python-Bugs-817611 ] Google kills socket lookup

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Bugs item #817611, was opened at 2003-10-04 11:11
Message generated for change (Comment added) made by ronaldoussoren
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Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Gerd Schulz (spikeee)
Assigned to: Nobody/Anonymous (nobody)
Summary: Google kills socket lookup

Initial Comment:
Just test:



>>> socket.gethostbyname('www.google.com')



'216.239.39.99'



>>> socket.gethostbyaddr('216.239.39.99')



Traceback (most recent call last):

  File "<interactive input>", line 1, in ?

herror: (11004, 'host not found')



Don't know why. Maybe of this strange akadns-stuff?!?!

He struggles around for quite a time before he comes to 

the error, maybe to much or cyclic input.



Cheers,

Spikeee

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Comment By: Ronald Oussoren (ronaldoussoren)
Date: 2003-10-05 16:41

Message:
Logged In: YES 
user_id=580910

This is not a bug/feature of the python socket module, but of DNS 

itself. DNS uses a seperate tree to find the name associated with 

an IP adres, there is no entry for the address associated with 

www.google.com.



The same feature can be observed from the command-line:



$ nslookup www.google.com ns.xs4all.nl

Server:         ns.xs4all.nl

Address:        194.109.6.66#53



Non-authoritative answer:

www.google.com  canonical name = www.google.akadns.net.

Name:   www.google.akadns.net

Address: 216.239.59.99



$ nslookup 216.239.59.99 ns.xs4all.nl

Server:         ns.xs4all.nl

Address:        194.109.6.66#53



** server can't find 99.59.239.216.in-addr.arpa: NXDOMAIN



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