查询 cname 记录
mannix@MannixdeMacBook-Pro-2 ~ % nslookup -qt=cname www.baidu.com
*** Invalid option: qt=cname
Server: 114.114.114.114
Address: 114.114.114.114#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 110.242.68.4
Name: www.a.shifen.com
Address: 110.242.68.3
mannix@MannixdeMacBook-Pro-2 ~ % dig www.baidu.com
; <<>> DiG 9.10.6 <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17768
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 847 IN CNAME www.a.shifen.com.
www.a.shifen.com. 124 IN A 110.242.68.4
www.a.shifen.com. 124 IN A 110.242.68.3
;; Query time: 55 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Sun Apr 17 01:31:57 CST 2022
;; MSG SIZE rcvd: 101