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The names are retrieved by doing a "Reverse DNS Lookup". You can check to see if the names are actually in the DNS PTR zone by doing a "ping -a <IP.Address> from a Windows PC.
You can also do an nslookup from the command prompt on your EE server and enter the IP Address of a node which did not resolve to a name.
Either the IPs are not in DNS, or the DNS queries are timing out. Perhaps your DNS server has some kind of flood control if too many queries come from one host in a brief period of time?