reverse DNS lookup

[Matt Mozur]

In looking over my firewall system logs I noticed a series
of rejects logged by ipfwadm.  It seems that someone was 
running a port scan on me.

I have their IP address - how do I determine the host name
& responsible authority for that host?

Thanks,

Matt

P.S I hope this is the right list for such a question - please
excuse me if it's not.
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