Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '209.173.252.0'
+180
ERRNo PTR record availible DNS server 'ns2.pslightwave.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.252.173.209.in-addr.arpa'.