Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '185.172.155.0'
+183
ERRNo PTR record availible DNS server 'ns1.perf1.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.155.172.185.in-addr.arpa'.