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.


Dark Fibre gives you maximum control and flexibility over your network, allowing your network to scale-up as your bandwidth requirements grow – providing virtually limitless capacity.


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

Dark Fibre can provide a highly cost-effective way of managing your own network, enabling you to add bandwidth as your capacity requirements increase.

Dark Fibre datasheet

Live chat with Sales

For all your purchase enquiries.
Monday to Friday 9am - 5pm

Chat with us

Contact us about Colt Dark Fibre:

Call a specialist

+44 (0) 20 7863 5510

Case Study


Source invests in Colt’s scalable IT and network infrastructure solution to support over $500 billion worth of transactions Source UK Services Ltd, an independent fund promotion firm specialising in exchange-traded products, they enlisted Colt’s help to manage infrastructure challenges due…

Related Product


Providing ultra-high bandwidth connectivity, Colt Spectrum enables you to leverage your own investments in DWDM equipment, whilst benefiting from Colt’s extensive optical network reach and connectivity.


Colt and Ciena – raising the bar throughout the industry

Colt and Ciena have come together to raise industry standards by forming a partnership, which services the high bandwidth demands of the future. …


Meet Kostas, Product Management Associate

“I joined the Graduate scheme over a year ago and since then I’ve had the opportunity to work on many different projects. My role enables me to build relationships with other functions and meet colleagues across the globe. I get the the full experience of the amazing challenger culture at Colt.”

Careers at Colt
The project was a complete success and we achieved the goal we set. Collaboration with Colt was excellent. John Sudbury
CEO Ekovolt

Awards & Accreditations