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::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/TXT: 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)
tkgdo6rfc1.yandex.ru/A has warnings; select the "Denial of existence" DNSSEC option to see them.
yandex.ru/DNSKEY has warnings; select the "Denial of existence" DNSSEC option to see them.