August 28, 2026 Installation Status for Fixed Terminal System Transmission Facilities as at End of FY 2025

- Collective Share of Installed Subscriber Lines for NTT East and West -

　The Ministry of Internal Affairs and Communications (MIC) has received reports from telecommunications carriers regarding the installation status of their fixed terminal system transmission facilities as at the end of FY 2025 (end of March 2026), in accordance with Article 3, Paragraph 1 of the Telecommunications Business Reporting Regulations (Ministry of Posts and Telecommunications Ordinance No. 46 of 1988). MIC will publish the aggregated results.

Note: The published materials are in Japanese only.

1　 Purpose

To designate Class 1 telecommunications facilities in accordance with the provisions of Article 33, Paragraph 1 of the Telecommunications Business Act (Act No. 86 of 1984), MIC receives reports from telecommunications carriers installing fixed terminal system transmission facilities (*) every fiscal year regarding the installation status of such facilities as at the end of the fiscal year, in accordance with Article 3, Paragraph 1 of the Telecommunications Business Reporting Regulations.
We have aggregated and compiled reports from telecommunications carriers regarding their installation status as at the end of FY 2025. We will publish the results.

* Transmission facilities in which one end of transmission facilities, such as telephone lines or optical fibers, is connected to a user's telecommunications facilities installed in a specific location (hereinafter referred to as the "subscriber line").

2　 Summary of results

A summary of the aggregated results is shown below. NTT EAST, Inc. is hereinafter referred to as "NTT East." NTT WEST, Inc. is hereinafter referred to as "NTT West."

1.　 Collective share of installed subscriber lines for NTT East and West

• (1) 　The collective share of installed subscriber lines for NTT East and West decreased from 69.0% at the end of FY 2024 to 68.6% at the end of FY 2025, a drop of 0.3 percentage points. This decrease is mainly attributed to a decrease in the share of metal lines (two-wire systems), which are predominantly monopolized by NTT East and West (92.4%), from 28.3% at the end of FY 2024 to 25.6% at the end of FY 2025.
• (2) 　Looking at NTT East and NTT West separately, NTT East’s share of installed subscriber lines is increasing, while NTT West’s share is decreasing. (NTT East: 75.4% at the end of FY 2024 -> 75.6% at the end of FY 2025, an increase of 0.2 percentage point. NTT West: 62.4% at the end of FY 2024 -> 61.6% at the end of FY 2025, a drop of 0.8 percentage point.)
• (3) 　 When broken down by prefecture, the prefectures where collective share of installed subscriber lines for NTT East and West fell below 50% were Mie (49.3%) and Nara (49.4%). The percentages for the following six prefectures were in the 50% range: Hyogo (50.4%), Aichi (52.6%), Osaka (53.4%), Shiga (53.8%), Gifu (55.4%), and Tokushima (59.7%).

2.　 Collective share of installed optical fiber lines for NTT East and West

• (1) 　The collective share of installed optical fiber lines for NTT East and West decreased from 72.1% at the end of FY 2024 to 71.7% at the end of FY 2025, a drop of 0.4 percentage points. This decrease is attributed to the increased installation of optical fibers by power companies and regional CATV operators.
• (2) 　The respective shares of installed optical fiber lines for NTT East and West declined. (NTT East: 87.8% at the end of FY 2024 -> 87.4% at the end of FY 2025, a drop of 0.4 percentage points; NTT West: 58.2% at the end of FY 2024 -> 57.7% at the end of FY 2025, a drop of 0.5 percentage point.)
• (3) 　For the collective share of installed optical fiber lines for NTT East and West by prefecture, eight prefectures are below 50%: Mie (36.5%), Nara (38.0%), Aichi (42.4%), Gifu (44.1%), Shiga (44.1%), Tokushima (46.3%), Hyogo (48.1%) and Oita (49.6%).