Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '104.171.199.0'
+422
ERRNo PTR record availible DNS server 'ns-1637.awsdns-12.co.uk' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.199.171.104.in-addr.arpa'.