Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2a04:2f81:4::'
+169
ERRNo PTR record availible DNS server 'ns-1979.awsdns-55.co.uk' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.0.0.1.8.f.2.4.0.a.2.ip6.arpa'.