Print Canonical Addresses of a Site

This 2 lines of Python queries DNS and display the canonical names of a host.  It's like a simple DNS lookup (nslookup).

#!/usr/bin/python

import sys
import socket

HOST=''
PORT=80

if (len(sys.argv) < 2):
 print sys.argv[0], " "
 sys.exit(0)

HOST = sys.argv[1]
for res in socket.getaddrinfo(HOST, PORT, socket.AF_UNSPEC, socket.SOCK_STREAM):
   print res[4][0]

For example, if we execute the script and pass parameter 'www.google.com', we'd get this:

$ ./getdns.py www.google.com
74.125.224.50
74.125.224.51
74.125.224.48
74.125.224.49
74.125.224.52