risupu.jp を whois.jprs.jp にて検索しました:

[ JPRS database provides information on network administration. Its use is    ]
[ restricted to network administration purposes. For further information,     ]
[ use 'whois -h whois.jprs.jp help'. To suppress Japanese output, add'/e'     ]
[ at the end of command, e.g. 'whois -h whois.jprs.jp xxx/e'.                 ]
Domain Information: [ドメイン情報]
[Domain Name]                   RISUPU.JP
[登録者名]                      （登録者からの申請により非表示）
詳細は→https://jprs.jp/about/dom-rule/whois-concealment/
[Registrant]                    (Not displayed by registrant's request)
For details -> https://jprs.jp/about/dom-rule/whois-concealment/ (only in Japanese)
[Name Server]                   ns-a1.risupu.jp
[Name Server]                   ns-a2.risupu.jp
[Name Server]                   ns-a3.risupu.jp
[Signing Key]
[登録年月日]                    2019/09/26
[有効期限]                      2023/09/30
[状態]                          Active
[最終更新]                      2022/10/01 01:05:07 (JST)
Contact Information: [公開連絡窓口]
[名前]                          Whois情報公開代行サービス by ConoHa
[Name]                          Whois Privacy Protection Service by ConoHa
[Email]                         info@conoha.jp
[Web Page]
[郵便番号]                      150-8512
[住所]                          東京都渋谷区
桜丘町26-1
セルリアンタワー
[Postal Address]                Shibuya-ku
26-1 Sakuragaoka-cho
Cerulean Tower
[電話番号]                      +81.367020428
[FAX番号]