Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '168.143.0.0'
+456
ERRNo PTR record availible DNS server 'auth25.ns.gin.ntt.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.143.168.in-addr.arpa'.