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Hi cj54487 - The reason you may not be getting DNS names for some IP addresses is that they may not have PTR records in your DNS database.
When IPAT finds IP's, it runs a reverse DNS lookup (IP->Name) which come from a PTR entry, whereas most DNS queries are for A records (Name->IP).
You may find a feature on your DNS server to create PTR records automatically, or you might have to add them manually.
That was the problem. Thanks for the quick response Greg.