www.soumu.go.jp/main_sosiki/joho_tsusin/top/tel_number/number_shitei.html
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総務省｜電気通信番号制度｜電気通信番号指定状況 （電気通信番号計画（令和元年総務省告示第6号）第1第4項による公表）
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https://www.soumu.go.jp/main_sosiki/joho_tsusin/top/tel_number/number_shitei.html
About this page
This page publishes the Ministry of Internal Affairs and Communications' status of telecommunications number assignments as of April 1, 2026. It provides assignment information for 15 types of telecommunications numbers, including fixed phone numbers, mobile phone numbers (060-090), IP phone numbers (050), toll-free numbers (0120, 0800), and shared numbers (0570). Data is available in both PDF and Excel formats. For fixed phone numbers, the assignment status of local exchange codes is organized by the first digit of area codes. The page also reports that as of April 1, 2025, there are no cases of number assignment expiration, cancellation, or other status changes.
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