Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '205.220.188.0'
+375
ERRNo PTR record availible DNS server 'ns3.proofpoint.us' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.188.220.205.in-addr.arpa'.