usen.ad.jp

The registry answered, but its answer does not say whether the name is taken. Its full answer is below.

Checked

WHOIS

[ 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]
a. [ドメイン名]                 USEN.AD.JP
e. [そしきめい]                 あるてりあ・ねっとわーくすかぶしきかいしゃ
f. [組織名]                     アルテリア・ネットワークス株式会社
g. [Organization]               ARTERIA Networks Corporation
k. [組織種別]                   JPNIC会員ネットワーク
l. [Organization Type]          JPNIC Member's Network
m. [登録担当者]                 SA12244JP
n. [技術連絡担当者]             TK27075JP
p. [ネームサーバ]               ns01.usen.ad.jp
p. [ネームサーバ]               ns02.usen.ad.jp
p. [ネームサーバ]               ns03.usen.ad.jp
s. [署名鍵]                     
[状態]                          Connected (2026/12/31)
[登録年月日]                    2000/12/15
[接続年月日]                    2001/02/14
[最終更新]                      2026/01/01 01:02:25 (JST)