yandex.ru zone: The server(s) were not responsive to queries over TCP. See RFC 1035, Sec. 4.2. (2a02:6b8:0:1::1)
yandex.ru/DNSKEY: No response was received from the server over UDP (tried 4 times). See RFC 1035, Sec. 4.2. (2a02:6b8:0:1::1, UDP_-_EDNS0_512_D_KN)
yandex.ru/SOA: No response was received from the server over TCP (tried 3 times). See RFC 1035, Sec. 4.2. (2a02:6b8:0:1::1, TCP_-_EDNS0_4096_D_N)
yandex.ru/DNSKEY has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (4)
yandex.ru/A: 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. (2a02:6b8:0:1::1, UDP_-_EDNS0_4096_D_KN)
yandex.ru/SOA: 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. (2a02:6b8:0:1::1, UDP_-_EDNS0_4096_D_KN_0x20)
yandex.ru/CNAME has warnings; select the "Denial of existence" DNSSEC option to see them.
39eqr.btzey.yandex.ru/A has warnings; select the "Denial of existence" DNSSEC option to see them.