$dig
www.speedtest.net @
223.5.5.5
; <<>> DiG 9.10.6 <<>>
www.speedtest.net @
223.5.5.5
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36001
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;
www.speedtest.net. IN A
;; ANSWER SECTION:
www.speedtest.net. 30 IN CNAME
zd.map.fastly.net.
zd.map.fastly.net. 30 IN A 151.101.110.219
;; Query time: 4 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Thu Jul 30 11:46:21 CST 2020
;; MSG SIZE rcvd: 79
$dig
speedtest.net @
223.5.5.5
; <<>> DiG 9.10.6 <<>>
speedtest.net @
223.5.5.5
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61266
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;
speedtest.net. IN A
;; ANSWER SECTION:
speedtest.net. 3600 IN A 151.101.130.219
speedtest.net. 3600 IN A 151.101.2.219
speedtest.net. 3600 IN A 151.101.66.219
speedtest.net. 3600 IN A 151.101.194.219
;; Query time: 244 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Thu Jul 30 11:46:34 CST 2020
;; MSG SIZE rcvd: 95
----------------------------------------------------------------------
$dig
cloudflare.com @
223.5.5.5
; <<>> DiG 9.10.6 <<>>
cloudflare.com @
223.5.5.5
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25486
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;
cloudflare.com. IN A
;; ANSWER SECTION:
cloudflare.com. 300 IN A 104.17.176.85
cloudflare.com. 300 IN A 104.17.175.85
;; Query time: 401 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Thu Jul 30 11:48:19 CST 2020
;; MSG SIZE rcvd: 64
$dig
www.cloudflare.com @
223.5.5.5
; <<>> DiG 9.10.6 <<>>
www.cloudflare.com @
223.5.5.5
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37218
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;
www.cloudflare.com. IN A
;; ANSWER SECTION:
www.cloudflare.com. 300 IN A 104.17.210.9
www.cloudflare.com. 300 IN A 104.17.209.9
;; Query time: 353 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Thu Jul 30 11:48:36 CST 2020
;; MSG SIZE rcvd: 68
------------------------------------------------------
测试了下并没有出现无法解析的情况, 另外楼主你测试 dns 解析的时候最好指定 dns 服务器