奇妙な返事をする権威サーバーだ。
1. whois
$ whois actelion.co.jp
Domain Information: a. [Domain Name] ACTELION.CO.JP g. [Organization] Actelion Pharmaceuticals Japan Ltd. l. [Organization Type] Corporation m. [Administrative Contact] SY12785JP n. [Technical Contact] GO1408JP p. [Name Server] ns1.jnj.com p. [Name Server] ns3.jnj.com p. [Name Server] ns5.jnj.com s. [Signing Key] [State] Connected (2023/07/31) [Registered Date] 2002/07/05 [Connected Date] 2002/07/05 [Last Update] 2022/08/01 01:03:19 (JST)
2. history
$ dig -t mx actelion.co.jp @ns1.jnj.com (MXはないとの返事だが、それならCNAMEを返さないのはなぜ。) $ dig -t a actelion.co.jp @ns1.jnj.com actelion.co.jp. 1800 IN CNAME actelion.co.jp.cdn.cloudflare.net.
$ dig -t ns actelion.co.jp @ns1.jnj.com ; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> -t ns actelion.co.jp @ns1.jnj.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18406 ;; flags: qr aa rd; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ; COOKIE: 721928b1b260dc0cd0e1cade6355d4ce884646bc49b1e331 (good) ;; QUESTION SECTION: ;actelion.co.jp. IN NS ;; ANSWER SECTION: actelion.co.jp. 1800 IN NS ns3.jnj.com. actelion.co.jp. 1800 IN NS ns5.jnj.com. actelion.co.jp. 1800 IN NS ns1.jnj.com. ;; Query time: 179 msec ;; SERVER: 148.177.2.10#53(ns1.jnj.com) (UDP) ;; WHEN: Mon Oct 24 08:57:02 JST 2022 ;; MSG SIZE rcvd: 132
;; ANSWER SECTION: www.actelion.co.jp. 1800 IN CNAME www.actelion.co.jp.cdn.cloudflare.net. www.actelion.co.jp.cdn.cloudflare.net. 300 IN A 104.18.42.109 www.actelion.co.jp.cdn.cloudflare.net. 300 IN A 172.64.145.147