DNS/オープンリゾルバー/ukについて、ここに記述してください。

1. OK

2. vul

5.133.40.77 ns1.solwaycomms.net.

%dig -t txt c.sub.mufj.jp @5.133.40.77 ~

; <<>> DiG 9.12.1 <<>> -t txt c.sub.mufj.jp @5.133.40.77
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2633
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;c.sub.mufj.jp.                 IN      TXT

;; ANSWER SECTION:
c.sub.mufj.jp.          600     IN      TXT     "Your_cache_server_is_vulnerable."

;; Query time: 716 msec
;; SERVER: 5.133.40.77#53(5.133.40.77)
;; WHEN: Sun Feb 24 21:44:23 JST 2019
;; MSG SIZE  rcvd: 76

194.187.251.67
manchester-ns01.cyberghostvpn.com.
        Manchester      PowerDNS Recursor 4.0.8 (built Feb 27 2018 17:19:58 by portage@frankfurt-ns02) 

213.171.206.141
server213-171-206-141.live-servers.net.
                Microsoft DNS 6.1.7601 (1DB15EC5)