Yes but you might find that the name was not resolved at the time the connection was made.
I have recently had this issue with some of my ISP's name servers returning null hostnames on reverse lookups where in fact proper names were there. This seems to be a behaviour sometimes seen in very busy name servers (I think they run BIND but I don't know what version).
I just asked them for a more reliable name server to query and I have not seen this issue since.
HTH
Chris Linfoot
http://chris-linfoot.net
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. . Shouldn't that have been blocked ba... (~Karl Eknuplopo... 6.Jan.04) 
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