用 opendns 的非标端口就行了。
; <<>> DiG 9.3.2 <<>> @
208.67.222.222
www.twitter.com -p5353
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1680
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;
www.twitter.com. IN A
;; ANSWER SECTION:
www.twitter.com. 584 IN CNAME
twitter.com.
twitter.com. 11 IN A 199.59.150.7
twitter.com. 11 IN A 199.59.148.10
twitter.com. 11 IN A 199.59.148.82
twitter.com. 11 IN A 199.59.150.39
;; Query time: 180 msec
;; SERVER: 208.67.222.222#5353(208.67.222.222)
;; WHEN: Mon May 16 13:00:52 2016
;; MSG SIZE rcvd: 111