ip6.arpa zone: The server(s) were not responsive to queries over UDP. See RFC 1035, Sec. 4.2. (200.7.86.53, 2001:13c7:7012::53)
ip6.arpa/DNSKEY: No response was received from the server over UDP (tried 4 times). See RFC 1035, Sec. 4.2. (2001:43f8:110::11, UDP_-_EDNS0_512_D_KN)
ip6.arpa/NS: No response was received from the server over UDP (tried 12 times). See RFC 1035, Sec. 4.2. (200.7.86.53, 2001:13c7:7012::53, UDP_-_NOEDNS_)
ip6.arpa/DNSKEY has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (5)
ip6.arpa/DNSKEY (alg 8, id 21619): No response was received from the server over UDP (tried 6 times) until the COOKIE EDNS option was removed (however, this server appeared to respond legitimately to other queries with the COOKIE EDNS option present). See RFC 6891, Sec. 6.1.2. (2001:43f8:110::11, UDP_-_EDNS0_4096_D_KN)
ip6.arpa/DNSKEY (alg 8, id 2379): No response was received from the server over UDP (tried 6 times) until the COOKIE EDNS option was removed (however, this server appeared to respond legitimately to other queries with the COOKIE EDNS option present). See RFC 6891, Sec. 6.1.2. (2001:43f8:110::11, UDP_-_EDNS0_4096_D_KN)
ip6.arpa/DNSKEY (alg 8, id 64060): No response was received from the server over UDP (tried 6 times) until the COOKIE EDNS option was removed (however, this server appeared to respond legitimately to other queries with the COOKIE EDNS option present). See RFC 6891, Sec. 6.1.2. (2001:43f8:110::11, UDP_-_EDNS0_4096_D_KN)
ip6.arpa/NS: No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size. See RFC 6891, Sec. 6.2.6. (2001:43f8:110::11, UDP_-_EDNS0_4096_D_KN)
ip6.arpa/DNSKEY has warnings; select the "Denial of existence" DNSSEC option to see them.