Unable to find any PTR-records for the specified domain/ip :(
Log
+006
Resolving PTR record of '2001:730::'
+340
ERRNo PTR record availible DNS server 'ns1.upc.biz' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.7.0.1.0.0.2.ip6.arpa'.