The dark fibre network to meet any future business need

Building a network to support bandwidth-intensive business applications? Or creating your own backhaul network? Colt’s dark fibre network is the most extensive and reliable in Europe.  We cover 47 metropolitan areas which are interconnected by our 38,000km network. We're confident our dark fibre network will meet any future business need.


Build your business on Colt’s trusted, scalable, dark fibre network.


Colt’s Dark Fibre network will scale to meet any future bandwidth needs. From a single 10G link or multiple 100G services.


Dark Fibre services you can trust to perform. We invest heavily in our network. Which is why we're used by many of the world's leading carriers, operators, and service providers.

Cost Effective

It’s easy to manage Dark Fibre costs because we let you add extra bandwidth and services to the network only when you need it.

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Michael John Lytle


The two things that Colt does impeccably well is providing us with a robust physical infrastructure that does exactly what it's supposed to do, with no noticeable impact on the user. The second thing is the enhanced reporting and performance analysis of our website to see what's going on in the Web environment.

A managed, custom dark fibre network, with a range of flexi-options


Our network offers a range of privacy options over physically separate and secure networks. And it's monitored 24/7 by network specialists to ensure your peace of mind.


Build a dark fibre network that will meet all your coming business needs. Our solution architects are available to help from planning through to design and beyond.


Carriers and operators have different needs from service providers and enterprise. So we offer a range of commercial options inc. standard leads and long-term IRU agreements.

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+44 (0) 20 7863 5510