Multiple IPs to check - public DNS-resolvers will be used (Google and OpenDNS)
+016
Resolving PTR record of '13.107.21.200'
+026
ERRNo PTR record availible DNS server '8.8.8.8' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '200.21.107.13.in-addr.arpa'.
+026
Resolving PTR record of '204.79.197.200'
+035
PTR-record resolved in a total of 8ms. Responding DNS-server: 208.67.222.222.
+035
Resolving PTR record of '2620:1ec:c11::200'
+047
ERRNo PTR record availible DNS server '208.67.222.222' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.1.c.0.c.e.1.0.0.2.6.2.ip6.arpa'.