Python lookup hostname from IP with 1 second timeout

Question

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!

Answer 1

>>> 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.

Answer 2

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.