さくらに向けた lame delegation は簡単に乗取可能。(ゾーンは誰でも作れる。)

$ dig -t ns dns1.tokyo @ns1.dns.ne.jp

; <<>> DiG 9.18.1-1ubuntu1.3-Ubuntu <<>> -t ns dns1.tokyo @ns1.dns.ne.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20341
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; NSID: 66 38 62 30 36 35 39 66 2d 35 39 31 39 2d 34 35 66 36 2d 62 62 62 33 2d 65 65 30 66 34 64 37 39 64 32 32 36 ("f8b0659f-5919-45f6-bbb3-ee0f4d79d226")
;; QUESTION SECTION:
;dns1.tokyo.                    IN      NS

;; ANSWER SECTION:
dns1.tokyo.             3600    IN      NS      ns2.dns.ne.jp.
dns1.tokyo.             3600    IN      NS      ns1.dns.ne.jp.

;; Query time: 4 msec
;; SERVER: 61.211.236.1#53(ns1.dns.ne.jp) (UDP)
;; WHEN: Sun Feb 05 11:16:50 JST 2023
;; MSG SIZE  rcvd: 124

1. history

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