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How can I look up a hostname given an IP address? Furthermore, how can I specify a timeout in case no such reverse DNS entry exists? Trying to keep things as fast as possible. Or is there a better way? Thank you!
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Get Hostname in Python platform. node() function returns a string that displays the information about the node basically the system's network name.
Click the Windows Start button, then "All Programs" and "Accessories." Right-click on "Command Prompt" and choose "Run as Administrator." Type "nslookup %ipaddress%" in the black box that appears on the screen, substituting %ipaddress% with the IP address for which you want to find the hostname.
>>> import socket >>> socket.gethostbyaddr("69.59.196.211") ('stackoverflow.com', ['211.196.59.69.in-addr.arpa'], ['69.59.196.211']) For implementing the timeout on the function, this stackoverflow thread has answers on that.
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What you're trying to accomplish is called Reverse DNS lookup.
socket.gethostbyaddr("IP") # => (hostname, alias-list, IP) http://docs.python.org/library/socket.html?highlight=gethostbyaddr#socket.gethostbyaddr
However, for the timeout part I have read about people running into problems with this. I would check out PyDNS or this solution for more advanced treatment.
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