l$ dig dnssec-failed.org +dnssec @8.8.8.8

; <<>> DiG 9.18.1-1ubuntu1.3-Ubuntu <<>> dnssec-failed.org +dnssec @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 1446
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 512
;; QUESTION SECTION:
;dnssec-failed.org.             IN      A

;; Query time: 287 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Sun Feb 19 17:19:22 JST 2023
;; MSG SIZE  rcvd: 46

1. another reason

tmaeno@tokyo:~/com/ggl$ dig dnssec-failed.mufj.jp +dnssec @8.8.8.8

; <<>> DiG 9.18.1-1ubuntu1.3-Ubuntu <<>> dnssec-failed.mufj.jp +dnssec @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 26257
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 512
;; QUESTION SECTION:
;dnssec-failed.mufj.jp.         IN      A

;; Query time: 39 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Sun Feb 19 17:19:37 JST 2023
;; MSG SIZE  rcvd: 50

2. history

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