>>> import itertools
>>> import socket
>>> l = ['lemon', 'orange', 'apple']
>>> suf = ['.com', '.org', '.net']
>>> for i in itertools.chain(*[map(lambda a: i + a, l) for i in l]):
...     try:
...             for s in suf: print "%s - %s" % (i+s, socket.gethostbyname(i+s))
...     except socket.gaierror:
...             print '%s - no such domain' % (i+s)
... 
lemonlemon.com - 204.13.160.129
lemonlemon.org - no such domain
lemonorange.com - 207.58.151.96
lemonorange.org - no such domain
lemonapple.com - 82.98.86.169
lemonapple.org - no such domain
orangelemon.com - 66.199.187.182
orangelemon.org - no such domain
orangeorange.com - 208.254.26.132
orangeorange.org - 127.0.0.1
orangeorange.net - 81.2.197.230
orangeapple.com - 207.7.108.211
orangeapple.org - no such domain
applelemon.com - 66.33.221.126
applelemon.org - no such domain
appleorange.com - 64.202.189.170
appleorange.org - no such domain
appleapple.com - 82.98.86.176
appleapple.org - no such domain
>>>