sei.co.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]                 SEI.CO.JP
e. [そしきめい]                 すみともでんきこうぎょうかぶしきかいしゃ
f. [組織名]                     住友電気工業株式会社
g. [Organization]               SUMITOMO ELECTRIC INDUSTRIES, LTD.
k. [組織種別]                   株式会社
l. [Organization Type]          Corporation
m. [登録担当者]                 TM85201JP
n. [技術連絡担当者]             EA9934JP
p. [ネームサーバ]               seigate.sei.co.jp
p. [ネームサーバ]               seigate-y.sei.co.jp
p. [ネームサーバ]               gemini.starnet.ad.jp
s. [署名鍵]                     
[状態]                          Connected (2026/10/31)
[ロック状態]                    AgentChangeLocked
[登録年月日]                    1996/10/21
[接続年月日]                    1996/11/21
[最終更新]                      2026/02/06 15:07:05 (JST)