tools zone: The server(s) were not responsive to queries over UDP. See RFC 1035, Sec. 4.2. (2a01:8840:1f::44)
jvhzx7i9c4.go.dnscheck.tools/A has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (2)
tools/DS (alg 8, id 13831): The server appears to support DNS cookies but did not return a COOKIE option. See RFC 7873, Sec. 5.2.3. (192.5.5.241, UDP_-_EDNS0_4096_D_KN)
tools/DS (alg 8, id 13831): The server appears to support DNS cookies but did not return a COOKIE option. See RFC 7873, Sec. 5.2.3. (192.5.5.241, UDP_-_EDNS0_4096_D_KN)