我dig xkcd.com，我得到了这样的东西：
; <<>> DiG 9.9.5-3ubuntu0.1-Ubuntu <<>> xkcd.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52538
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;xkcd.com. IN A
;; ANSWER SECTION:
xkcd.com. 769 IN A 107.6.106.82
;; AUTHORITY SECTION:
xkcd.com. 87784 IN NS dns3.p03.nsone.net.
xkcd.com. 87784 IN NS dns1.p03.nsone.net.
xkcd.com. 87784 IN NS dns2.p03.nsone.net. …