Company lists · Data refreshed September 2026

Top 25 Fiber optic telecommunications companies based in Germany

Name: Fiber optic telecommunications companies based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 357 companies tracked

RevenueBase identified 357 fiber optic telecommunications companies headquartered in Germany as of September 2026 and tracks 8,121 professional contacts across them, including 3,846 with verified work emails. Berlin is the largest hub.

This list covers fiber optic telecommunications companies headquartered in Germany, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

357Companies

8,121Contacts tracked

3,846Verified emails

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The 25 largest fiber optic telecommunications companies based in Germany

Ranked by team size

Top 25 of 357 fiber optic telecommunications companies based in Germany, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to fiber optic telecommunications companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Deutsche Glasfaser Unternehmensgruppe	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	1,001-5,000	1,086 contacts →
	Indirect evidence “Wir sind der Digital-Versorger für das private, soziale, wirtschaftliche und öffentliche Leben in den Regionen.” Source: RevenueBase Database · checked Sep 30, 2026
2	1&1 Versatel	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	1,001-5,000	863 contacts →
	Indirect evidence “1 & 1 Versatel - Der deutsche Glasfaserspezialist 1 & 1 Versatel ist als Telekommunikationsspezialist für Firmenkunden einer der führenden Anbieter von Daten, Internet- und…” Source: RevenueBase Database · checked Sep 30, 2026
3	M-Net Telekommunikations Gmbh	Indirect evidence	Munich, GermanyHQ checked Sep 30, 2026	501-1,000	443 contacts →
	Indirect evidence “Als führender Glasfaseranbieter Bayerns verbindet M-net seit 1996 Menschen und Unternehmen in Bayern, im Großraum Ulm und im hessischen Main-Kinzig-Kreis mit zuverlässiger…” Source: RevenueBase Database · checked Sep 30, 2026
4	Deutsche Giganetz Gmbh	Partial evidence	Hamburg, GermanyHQ checked Sep 30, 2026	501-1,000	438 contacts →
	Partial evidence “Die Deutsche GigaNetz GmbH mit Hauptsitz in Hamburg betreibt in Deutschland einen qualitätsorientierten Glasfasernetzausbau bis in die eigenen vier Wände (FttH – Fiber To The…” Source: RevenueBase Database · checked Sep 30, 2026
5	Pÿur Tele Columbus	Indirect evidence	Berlin, GermanyHQ checked Sep 30, 2026	1,001-5,000	356 contacts →
	Indirect evidence “Die Tele Columbus AG ist einer der führenden Glasfasernetzbetreiber in Deutschland mit einer Reichweite von mehr als drei Millionen Haushalten.” Source: RevenueBase Database · checked Sep 30, 2026
6	Plusnet Gmbh	Indirect evidence	Cologne, GermanyHQ checked Sep 30, 2026	201-500	248 contacts →
	Indirect evidence “Die Plusnet GmbH, eine Tochtergesellschaft der EnBW, ist ein deutsches Telekommunikationsunternehmen mit Fokus auf Geschäftskunden.” Source: RevenueBase Database · checked Sep 30, 2026
7	OXG Glasfaser Gmbh	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	201-500	209 contacts →
	Indirect evidence “Die Glasfaser-Expert*innen: Wir von der OXG Glasfaser GmbH bauen und betreiben ein schnelles und zuverlässiges Glasfaser-Netz in Deutschland.” Source: RevenueBase Database · checked Sep 30, 2026
8	Sipgate	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	201-500	201 contacts →
	Indirect evidence “Founded in 2004, we at sipgate were the first German VoIP provider and have been developing internet and telephony services ever since.” Source: RevenueBase Database · checked Sep 30, 2026
9	Netcom BW Gmbh	Indirect evidence	Ellwangen (jagst), GermanyHQ checked Sep 30, 2026	201-500	161 contacts →
	Indirect evidence “Schnelles Internet für die Region #vernetzt - mit Highspeed in Verbindung bleiben Die NetCom BW GmbH mit Sitz in Ellwangen wurde 2014 gegründet und ist eine Konzerngesellschaft…” Source: RevenueBase Database · checked Sep 30, 2026
10	DNS NET Internet Service Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 30, 2026	201-500	145 contacts →
	Indirect evidence “Menschen mit Lichtgeschwindigkeit begeistern – das ist die Vision, die die rund 250 Mitarbeiter:innen der DNS:NET Familie antreibt.” Source: RevenueBase Database · checked Sep 30, 2026
11	Glasfaserplus Gmbh	Indirect evidence	Cologne, GermanyHQ checked Sep 30, 2026	51-200	132 contacts →
	Indirect evidence “Wir bringen das Netz der Zukunft in Ihre Region!” Source: RevenueBase Database · checked Sep 30, 2026
12	Rosenberger-Osi Gmbh & Co. OHG	Partial evidence	Augsburg, GermanyHQ checked Sep 30, 2026	501-1,000	125 contacts →
	Partial evidence “Since 1991, Rosenberger Optical Solutions & Infrastructure (Rosenberger OSI) has been a recognized expert for fiber-based connectivity, cabling solutions and infrastructure…” Source: RevenueBase Database · checked Sep 30, 2026
13	Glasfaser Nordwest Gmbh & Co. KG	Indirect evidence	Oldenburg, GermanyHQ checked Sep 30, 2026	201-500	119 contacts →
	Indirect evidence “Together for the future of the internet: Glasfaser Nordwest is the joint venture between EWE and Telekom.” Source: RevenueBase Database · checked Sep 30, 2026
14	Westconnect	Indirect evidence	Essen, GermanyHQ checked Sep 30, 2026	51-200	111 contacts →
	Indirect evidence “Leistungsstarkes Glasfaser-Internet ist das Rückgrat für digitales Leben und Arbeiten, für Industrie 4.0 und moderne Verwaltung.” Source: RevenueBase Database · checked Sep 30, 2026
15	GVG Glasfaser	Indirect evidence	Kiel, GermanyHQ checked Sep 30, 2026	201-500	96 contacts →
	Indirect evidence “Wir planen, bauen und betreiben Glasfasernetze direkt bis in die Gebäude unserer Endkunden.” Source: RevenueBase Database · checked Sep 30, 2026
16	Envia TEL Gmbh	Indirect evidence	Markkleeberg, GermanyHQ checked Sep 30, 2026	201-500	94 contacts →
	Indirect evidence “Die envia TEL GmbH ist der führende regionale Telekommunikationsdienstleister und Netzbetreiber in Mitteldeutschland.” Source: RevenueBase Database · checked Sep 30, 2026
17	Fiber Experts Deutschland Gmbh	Partial evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	51-200	88 contacts →
	Partial evidence “Fiber Experts Deutschland GmbH ist ein auf Glasfaserausbau spezialisiertes Bauunternehmen mit Standorten in Düsseldorf und Köln.” Source: RevenueBase Database · checked Sep 30, 2026
18	TNG Stadtnetz Gmbh	Indirect evidence	Kiel, GermanyHQ checked Sep 30, 2026	201-500	88 contacts →
	Indirect evidence “TNG wurde 1997 in Kiel gegründet und hat sich von einem regionalen Anbieter zu einem der führenden Telekommunikationsanbieter Deutschlands entwickelt.” Source: RevenueBase Database · checked Sep 30, 2026
19	MIH Gmbh	Strong evidence	Horstmar, GermanyHQ checked Sep 30, 2026	1,001-5,000	82 contacts →
	Strong evidence “We plan, develop and build fiber optic networks.” Source: RevenueBase Database · checked Sep 30, 2026
20	Goetel Gmbh	Indirect evidence	Göttingen, GermanyHQ checked Sep 30, 2026	51-200	75 contacts →
	Indirect evidence “Herzlich willkommen bei Goetel, Ihrem Göttinger Glasfaseranbieter für Telefon- und Internet!” Source: RevenueBase Database · checked Sep 30, 2026
21	Pÿur Business	Indirect evidence	Leipzig, GermanyHQ checked Sep 30, 2026	51-200	69 contacts →
	Indirect evidence “Seit über 25 Jahren stehen wir für leistungsstarke IT-Lösungen für Geschäftskunden.” Source: RevenueBase Database · checked Sep 30, 2026
22	OEW Breitband Gmbh	Indirect evidence	Ehingen (donau), GermanyHQ checked Sep 30, 2026	51-200	64 contacts →
	Indirect evidence “The OEW Breitband GmbH was founded on August 4, 2021 by OEW, the broadband provider in the district of Sigmaringen GmbH & Co.” Source: RevenueBase Database · checked Sep 30, 2026
23	Leonet	Indirect evidence	Deggendorf, GermanyHQ checked Sep 30, 2026	51-200	62 contacts →
	Indirect evidence “LEONET ist seit über 16 Jahren auf dem Breitbandmarkt aktiv und setzt sich als Pionierunternehmen für digitale Chancengleichheit in ländlichen Regionen ein.” Source: RevenueBase Database · checked Sep 30, 2026
24	Metrofibre	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	11-50	53 contacts →
	Indirect evidence “metrofibre entwickelt, finanziert, baut und betreibt passive Glasfasernetze für Städte und größere Gemeinden und bringt so hochleistungsfähige und skalierbare digitale…” Source: RevenueBase Database · checked Sep 30, 2026
25	Teledata Gmbh	Indirect evidence	Friedrichshafen, GermanyHQ checked Sep 30, 2026	51-200	51 contacts →
	Indirect evidence “Das TeleData Netz - das Netz der Zukunft?” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: fiber optic telecommunications companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names fiber optic telecommunications companies.
Partial evidence: Its own public description names part of fiber optic telecommunications companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name fiber optic telecommunications companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 357 fiber optic telecommunications companies based in Germany

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Fiber optic telecommunications companies based in Germany at a glance

As of Sep 30, 2026

47.4%Verified-email coverage

22.7Average contacts per company

11-50Median size (employees)

6.7%Largest-city concentration · Berlin

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

122

11-50

114

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 357 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among fiber optic telecommunications companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Germany whose own description of what they do matches “fiber optic telecommunications companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names fiber optic telecommunications companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among fiber optic telecommunications companies, and records with no verified work email. Companies headquartered outside Germany are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 3,846 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names fiber optic telecommunications companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many fiber optic telecommunications companies are there based in Germany?

RevenueBase identified 357 fiber optic telecommunications companies headquartered in Germany as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Deutsche Glasfaser Unternehmensgruppe, headquartered in Dusseldorf, tops this list with the largest team on record.

Which city has the most fiber optic telecommunications companies?

Berlin leads with 24 headquartered companies, followed by Dusseldorf (11) and Hamburg (11).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 3,846 verified decision-maker contacts tracked across these 357 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.