Top Dark fiber companies | Leaders and Market Insights 2025

Top Dark fiber companies

The growth of this industry is proliferated by exponential rise in cloud computing, IoT applications, and the global 5G rollout, creating surging requirements for low-latency and secure private networks.

Apart from this, another pivotal driver is the proliferation of cloud and edge data centers, which increasingly rely on dark fiber to support massive interconnectivity demands which makes dark fiber the backbone of next-gen digital infrastructure. Additionally, the growth is further bolstered by telecom operators’ need to boost bandwidth capacities in response to soaring data traffic.

1. Zayo Group

Zayo is a major provider of dark fiber infrastructure, offering extensive fiber networks across North America and Europe. It supports carriers, hyperscalers, and enterprises with high-capacity solutions.

2. Crown Castle Inc.

Crown Castle operates thousands of route miles of fiber and provides dark fiber to support mobile carriers, data centers, and businesses needing scalable bandwidth.

3. Lumen Technologies, Inc.

Lumen provides one of the largest fiber networks globally, including extensive dark fiber offerings for high-performance, low-latency connectivity solutions.

4. Colt Technology Services Group Limited

Colt delivers dark fiber solutions across Europe and Asia, focusing on enterprise and financial services customers with secure and flexible network infrastructure.

5. euNetworks Group Limited

euNetworks operates metropolitan fiber networks in major European cities and specializes in dark fiber, wavelength, and high-bandwidth services.

6. Lightower Fiber Networks

Acquired by Crown Castle, Lightower was a key player in the U.S. Northeast, offering custom dark fiber networks for enterprises, carriers, and government.

7. FiberLight, LLC

FiberLight provides custom-built dark fiber solutions across Texas, the Southeast, and Mid-Atlantic regions, serving industries with mission-critical bandwidth needs.

8. Hexatronic Group AB

Hexatronic delivers fiber optic infrastructure, including passive dark fiber systems, mainly for telecom, enterprise, and municipal networks in Europe and North America.

9. Arelion

Arelion operates a global backbone with dark fiber capabilities, providing scalable infrastructure to carriers and hyperscale companies across Europe, Asia, and North America.

10. Reliance Jio Infocomm Ltd.

Jio offers one of the most expansive dark fiber networks in India, catering to telecom providers, ISPs, and enterprise customers with high-capacity connectivity solutions.

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