To check domain registration information, you just need whois codenote.net, but when this is written in Japanese with various details, it’s hard to understand.

・NTTコミュニケーションズ ドメイン登録サービス | Whoisにおける登録情報の公開について

The NTT Communications site has the English and Japanese correspondences written, so basically I should have checked by referencing this.

I think it’s more accurate and better to have people run the commands themselves to check rather than writing whois or other things in documentation.

That’s all from the Gemba.