Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '177.129.168.0'
+493
ERRNo PTR record availible DNS server 'AUTH21.NS.GIN.NTT.NET' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.168.129.177.in-addr.arpa'.