Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '206.50.0.0'
+360
ERRNo PTR record availible DNS server 'auth22.ns.gin.ntt.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.50.206.in-addr.arpa'.