Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '160.231.220.0'
+136
ERRNo PTR record availible DNS server 'cbru.br.ns.els-gms.att.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.220.231.160.in-addr.arpa'.