Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '154.214.221.0'
+520
ERRNo PTR record availible DNS server 'pns1.cloudns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.221.214.154.in-addr.arpa'.