Why can't I get IP of 'www.skr.mlit.go.jp'?

$ nslookup
> server 1.1.1.1
Default server: 1.1.1.1
Address: 1.1.1.1#53
> www.skr.mlit.go.jp
Server:         1.1.1.1
Address:        1.1.1.1#53

** server can't find www.skr.mlit.go.jp: SERVFAIL
> server 8.8.8.8
Default server: 8.8.8.8
Address: 8.8.8.8#53
> www.skr.mlit.go.jp
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
Name:   www.skr.mlit.go.jp
Address: 203.139.202.147
>

That’s a mystery to me:
Screen Shot 2020-01-01 at 8.28.30 PM

Can you post the results of this:

dig +short CHAOS TXT id.server @1.1.1.1
$ dig +short CHAOS TXT id.server @1.1.1.1
"NRT"
$
$ dig @1.1.1.1 www.skr.mlit.go.jp

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> @1.1.1.1 www.skr.mlit.go.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 13293
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;www.skr.mlit.go.jp.            IN      A

;; Query time: 4226 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Thu Jan 02 13:49:44 JST 2020
;; MSG SIZE  rcvd: 47

$

$ dig @8.8.8.8 www.skr.mlit.go.jp

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> @8.8.8.8 www.skr.mlit.go.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40381
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.skr.mlit.go.jp. IN A

;; ANSWER SECTION:
www.skr.mlit.go.jp. 0 IN A 211.7.234.179

;; Query time: 43 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Jan 02 13:50:44 JST 2020
;; MSG SIZE rcvd: 63

$

That domain’s configuration seems to be quite broken and its nameservers are (at least) partially not responding

https://dnsviz.net/d/skr.mlit.go.jp/dnssec/

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