arpa zone: The server(s) were not responsive to queries over TCP. See RFC 1035, Sec. 4.2. (2001:500:2::c)
arpa/SOA: No response was received from the server over TCP (tried 3 times). See RFC 1035, Sec. 4.2. (2001:500:2::c, TCP_-_EDNS0_4096_D_N)
Warnings (3)
arpa/DNSKEY: The server appears to support DNS cookies but did not return a COOKIE option. See RFC 7873, Sec. 5.2.3. (2001:500:2f::f, UDP_-_EDNS0_512_D_KN)
arpa/SOA: The server appears to support DNS cookies but did not return a COOKIE option. See RFC 7873, Sec. 5.2.3. (2001:500:2f::f, TCP_-_EDNS0_4096_D_KN_0x20)
arpa/DNSKEY has warnings; select the "Denial of existence" DNSSEC option to see them.