What （株）ＮＴＴ東日本－関信越 does

株式会社NTT東日本‐関信越 (NTT East Japan-Kanshinetsu) is a wholly-owned regional operating subsidiary of NTT East Japan (NTT東日本株式会社), one of four regional subsidiaries created to deliver localized telecommunications services within the larger NTT Group's post-privatization structure. Headquartered in Urawa-ku, Saitama City, and operating with roughly 180 employees, the entity delivers fixed-line telephony, optical fiber (FLET'S Hikari / 光ファイバー), and data communications services to individual consumers, business customers, and local government / municipal clients across the Koshinetsu and Hokuriku regions of Japan. Its go-to-market combines enterprise field sales for business clients, inside sales, and physical branch/service windows distributed throughout its geographic territory, with on-the-ground customer support positioned as a regional differentiator.

The company's core technology is conventional incumbent telecommunications infrastructure — copper and fiber access networks, switching and transmission systems, and integrated ICT service platforms — rather than proprietary differentiated platforms. Pricing is not publicly disclosed and the entity is not separately listed; ownership and capital flow sit entirely within NTT East Japan. Business model mechanics are not detailed in the available data, but as a regulated carrier subsidiary the revenue base is dominated by recurring subscription telecom services (telephony subscriptions, FLET'S Hikari fiber broadband, and data communications) plus contract-based work with regional municipalities.

Per a May 8, 2026 NTT East announcement, NTT East Japan-Kanshinetsu is scheduled to be merged into the parent NTT East Japan on July 1, 2026, alongside the three other regional subsidiaries (South Kanto, Tohoku, Hokkaido). As part of the same realignment, selected SE functions and order-to-activation coordination are being transferred to NTT-ME. Post-merger, the regional subsidiary will cease to exist as a separate legal entity, with the consolidated NTT East Japan positioned as the single customer-facing entity across former sub-regional territories.

Name

（株）ＮＴＴ東日本－関信越

Legal name

株式会社NTT東日本‐関信越

Website

https://kanshinetsu.ntt-east.co.jp

Company type

Private

Operating status

Acquired

Headcount range

101–250 employees

Short description

Wholly-owned regional subsidiary of NTT East Japan delivering fixed-line telephony, optical fiber, and data communications services to individual, business, and municipal customers across the Koshinetsu and Hokuriku regions of Japan, with operations scheduled to be merged into NTT East Japan on July 1, 2026.

Ownership category

akta.pro rank

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Infrastructure, Operations, Technology or R&D, Marketing or Sales

Distribution channels1 record

Marketing channels2 records

Core offering

NTT East - Kanshinetsu is a regional subsidiary of NTT East Japan that delivers telecommunications and ICT services — optical fiber internet (光ファイバー), fixed-line telephone, and data communications — to individual consumers, businesses, and local municipalities within the Koshinetsu region of Japan. The subsidiary operates an on-the-ground field presence supporting regional service delivery, and is scheduled to be fully integrated into the parent company NTT East on July 1, 2026.

Differentiator

Problem solved

Functional benefit

Products and services

• Optical Fiber Internet (光ファイバー)
• Fixed-Line Telephone Services
• Data Communications Services
• Regional ICT Solutions for Municipalities

Segments2 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• NTT東日本株式会社flagshipStrategic or Co-development Partner · 1 July 2026NTT東日本-関信越 is a regional subsidiary of NTT East Japan. On July 1, 2026, NTT東日本-関信越 will be fully integrated into NTT東日本株式会社 (parent company), ceasing to exist as a separate legal entity. The integration consolidates the previously separate operations of NTT East Japan and its four regional subsidiaries into a single unified NTT East Japan entity, streamlining regional telecommunications service delivery across Japan.

Recent moves4 records

Expansion highlights3 records

Emerging players

• Internet Initiative Japan (IIJ): Specialist Japanese data communications and cloud/network services provider. Overlaps with the subject company's enterprise data communications and ICT solutions segment, with a stronger focus on enterprise and IP network services than consumer fiber.

Broad incumbents

• J:COM: Major Japanese cable TV and broadband operator providing cable Internet, fixed-line telephony, and mobile services in regional Japan. Competes with NTT East's regional fiber and telephony services in overlapping service areas.
• KDDI (au): Major Japanese telecom carrier and direct competitor to NTT East's fiber and mobile services. Operates au mobile, au Hikari fiber, and bundled telecom services across Japan, including the Koshinetsu/Hokuriku regions served by the subject company.
• SoftBank Corp: Major Japanese telecom carrier offering mobile, SoftBank Hikari fiber, and bundled telecom services nationwide. Competes directly with NTT East's Flets Hikari fiber service in the subject company's regional service area.
• NTT Communications (OCN): Sibling NTT Group company focused on enterprise data communications, IP network services, and the OCN ISP brand. Overlaps with the subject company's enterprise data and ICT solutions segment but at a national/enterprise scale rather than regional consumer focus.

Direct peers

• NTT East Japan - Tohoku: Sister regional subsidiary of NTT East Japan serving the Tohoku (northeastern Japan) region. Provides the same fiber, fixed-line telephone, data, and ICT services to regional customers and municipalities; also being merged into NTT East on July 1, 2026.
• NTT East Japan - Hokkaido: Sister regional subsidiary of NTT East Japan serving Hokkaido. Operates an identical business model focused on fiber, fixed-line voice, data, and ICT services for regional customers; also merging into NTT East on July 1, 2026.
• NTT East Japan - Minami-Kanto: Sister regional subsidiary of NTT East Japan serving the Minami-Kanto region. Operates an identical business model (fiber, fixed-line telephone, data, ICT) to the subject company and is being merged into NTT East on the same July 1, 2026 date.

Others

• Biglobe: Japanese ISP and consumer broadband provider (KDDI group subsidiary). Adjacent to the subject company's data communications and ISP services, providing consumer Internet access as an alternative or complement to NTT's fiber offerings.

Regional players

• NTT West Japan: Companion NTT Group regional telecom operator serving western Japan (Kansai, Chugoku, Shikoku, Kyushu). Offers the same Flets Hikari fiber, fixed-line telephone, and data services under a structurally similar regional model to NTT East's subsidiaries.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks4 records

Key highlights5 records

Customer concentration

• LinkedInlinkedin.com/company/%EF%BC%88%E6%A0%AA%EF%BC%89%EF%BD%8E%EF%BD%94%EF%BD%94%E6%9D%B1%E6%97%A5%E6%9C%AC%EF%BC%8D%E9%96%A2%E4%BF%A1%E8%B6%8A

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about （株）ＮＴＴ東日本－関信越