Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '12.129.26.0'
+214
ERRNo PTR record availible DNS server 'udns1.ultradns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.26.129.12.in-addr.arpa'.