Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '160.202.21.0'
+156
ERRNo PTR record availible DNS server 'u.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.21.202.160.in-addr.arpa'.