Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '192.157.73.0'
+139
ERRNo PTR record availible DNS server 'ns-1517.awsdns-61.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.73.157.192.in-addr.arpa'.