Sure - There might be a reverse record in the WINs database, or the local machine's DNS cache.
IPAT makes a call to Winsock, which will query many sources including the local machine DNS cache, and any WINS and DNS servers that it knows about.
To view the local cache type the following at a command line: ipconfig /displaydns
To validate the result in IPAT, you can use ping -a to reverse resolve using the same methods.
'ping -a <ip address>'
Thank you Greg. Is there a way to have IPAT ignore WINS entires? Also, where would I modify IPAT to change the DNS servers it uses?