Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '173.241.87.0'
+236
ERRNo PTR record availible DNS server 'ns-376.awsdns-47.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.87.241.173.in-addr.arpa'.