9xgh25naqd.utwente.nl/A has errors; select the "Denial of existence" DNSSEC option to see them.
utwente.nl/CNAME has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (3)
nl/DNSKEY: The server appears to support DNS cookies but did not return a COOKIE option. See RFC 7873, Sec. 5.2.3. (2001:678:2c:0:194:0:28:53, UDP_-_EDNS0_512_D_K)
9xgh25naqd.utwente.nl/A has warnings; select the "Denial of existence" DNSSEC option to see them.
utwente.nl/CNAME has warnings; select the "Denial of existence" DNSSEC option to see them.