baidu.com/DNSKEY: No response was received from the server over UDP (tried 4 times). See RFC 1035, Sec. 4.2. (220.181.33.31, UDP_-_EDNS0_512_D_KN)
baidu.com/DNSKEY has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (2)
com to baidu.com: The following NS name(s) were found in the authoritative NS RRset, but not in the delegation NS RRset (i.e., in the com zone): dns.baidu.com See RFC 1034, Sec. 4.2.2.
com to baidu.com: The following NS name(s) were found in the delegation NS RRset (i.e., in the com zone), but not in the authoritative NS RRset: ns1.baidu.com See RFC 1034, Sec. 4.2.2.