Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '139.123.228.0'
+167
ERRNo PTR record availible DNS server 'r.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.228.123.139.in-addr.arpa'.