Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '185.31.204.0'
+356
ERRNo PTR record availible DNS server 'ns-1890.awsdns-44.co.uk' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.204.31.185.in-addr.arpa'.