[dns-operations] What is the reason of J-Root doesn't serve the arpa zone?

[Stephane Bortzmeyer]

On Mon, Dec 06, 2021 at 01:42:42AM +0900,
 Yasuhiro Orange Morishita / 森下泰宏 <yasuhiro at jprs.co.jp> wrote 
 a message of 89 lines which said:

> And I heard from another person that J-Root holds the arpa zone, but
> not delegated.  It is also interesting.

Indeed. It is funny.

% dig @j.root-servers.net NS arpa


; <<>> DiG 9.17.20-3-Debian <<>> @j.root-servers.net NS arpa
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31618
;; flags: qr aa rd; QUERY: 1, ANSWER: 12, AUTHORITY: 0, ADDITIONAL: 1
             ^^
	     :-)


;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1472
;; QUESTION SECTION:
;arpa.				IN	NS

;; ANSWER SECTION:
arpa.			518400	IN	NS	a.root-servers.net.
arpa.					518400	IN	NS
b.root-servers.net.
arpa.			518400	IN	NS	c.root-servers.net.
arpa.					518400	IN	NS
d.root-servers.net.
arpa.			518400	IN	NS	e.root-servers.net.
arpa.					518400	IN	NS
f.root-servers.net.
arpa.			518400	IN	NS	g.root-servers.net.
arpa.					518400	IN	NS
h.root-servers.net.
arpa.			518400	IN	NS	i.root-servers.net.
arpa.					518400	IN	NS
k.root-servers.net.
arpa.			518400	IN	NS	l.root-servers.net.
arpa.					518400	IN	NS
m.root-servers.net.

;; Query time: 3 msec
;; SERVER: 192.58.128.30#53(j.root-servers.net) (UDP)
;; WHEN: Sun Dec 05 17:18:44 UTC 2021
;; MSG SIZE  rcvd: 241