Zayo

Fiber network and colocation carrier

3.3(0 reviews)paidFounded 2007United States

eu datacenterus datacenterprivate networking

More than 240,000 route miles and 34 million fiber miles worldwide across North America, Europe and global reach (2026 figures)

What Zayo actually is

Zayo is a bandwidth infrastructure company — a Tier-1 carrier (AS6461) that sells fiber, wavelengths, Ethernet, dedicated internet access, IP transit, private networks and colocation, mostly on custom contracts. It is not a hosting provider in the sense our dedicated servers or private networking readers usually mean: you do not spin up a server in a control panel, you negotiate a circuit or a fiber pair with a sales engineer and wait for an install. If that sentence already feels like too much procurement, Zayo is not for you. If you are buying 10 Gbps waves between Chicago and Frankfurt, it is one of a short list of names you will be quoted against.

The company was founded in 2007 by Dan Caruso and a group of entrepreneurs in Boulder, Colorado, and grew almost entirely by acquisition: AboveNet in 2012 (45 states, 7 countries), Neo Telecoms and Geo Networks in 2014, Viatel in 2015, Allstream and Electric Lightwave in 2016-2017, Spread Networks in 2018, QOS Networks in 2021. In 2019 a consortium led by Digital Colony (now DigitalBridge) and EQT took it private for $14.3 billion. Zayo remains headquartered in Colorado and reports roughly $2.6 billion in annual revenue with around 4,600 employees.

The network scale is the story. By Zayo's own current numbers it operates more than 240,000 route miles worldwide and 34 million fiber miles, connecting over 1,900 data centres, 400+ markets and 380+ cloud on-ramps, with 90,000 on-net locations in North America alone. In March 2025 Zayo announced the acquisition of Crown Castle's fiber solutions business, which would add 100,000+ metro route miles, and it has committed to building more than 5,000 new long-haul route miles for AI-driven demand — including a 385-mile Chicago-to-Columbus route already under construction. Whatever else you conclude, this is a company actively pouring concrete.

Pricing: what you really pay

Nothing. That is: nothing is published. Zayo has no price list, no self-serve checkout, no hourly billing and no free tier. Every product — dark fiber, wavelengths, Ethernet, DIA, IP transit, colocation — is quoted by a sales team against your specific route, term and volume. The DB row we inherited claimed a $1,000 entry price; we could not verify that anywhere on Zayo's own material, and we have corrected it to null rather than repeat a number we cannot source.

What we can say from the published service descriptions: DIA runs from 100 Mbps to 100 Gbps with guaranteed bandwidth levels and capacity augmentation at 50% utilisation; Zayo states it conducts bi-annual pricing reviews to stay competitive. Colocation is available in carrier-neutral facilities (Zayo's "Quick-Connect" data centres, 100+ across North America) — again, quote-only. Contract terms are multi-year in practice, and installs for dark fiber and wavelengths are measured in weeks to months depending on construction.

Our practical guidance: budget for a procurement cycle, not a signup. If you need a 10 Gbps protected wave between two major metros, get quotes from Zayo, Lumen and a regional specialist in parallel — route diversity and install dates vary more than the headline price does, and the install timeline is often the real differentiator.

Performance & infrastructure

This is where Zayo is strong and where the numbers matter. The North American network includes 200+ metro markets, 324 400G-enabled points of presence, 11+ unique long-haul fiber routes for path diversity, six key Canadian border crossings and interconnects into Mexico, plus western and eastern cable landing stations feeding subsea systems (Dunant, Marea, Seabras-1, Apollo, FA-1/FA-1S and others). Zayo's wavelength network is 400G-enabled across 380+ access PoPs covering more than 52,000 buildings, and the company set a record for the world's longest 800G optical wavelength. Europe is covered through the legacy Neo/Geo/Viatel footprint — the UK and France especially — and Zayo Global Reach extends to Asia and Latin America largely through subsea and partner networks rather than owned metro fiber.

On SLAs, Zayo's published DIA/IP Transit service description is refreshingly specific: 99.9% availability unprotected, 99.95% for protected services. CloudLink (private cloud connectivity) advertises a 100% uptime guarantee. Contrast that with the hosting world, where "99.99%" often appears in marketing copy with no agreement behind it — here the targets are written into a service description with defined measurement. DDoS protection is a real product, not a checkbox: in-line, network-based, delivered from a Tier-1 backbone with 50 Tb+ of mitigation capacity, priced as a subscription overlay covering every Zayo IP address, backed by 24/7 NOC and SOC operations.

Peering posture is worth noting for the network-literate: Zayo's peering policy is restrictive — ratio and contract requirements, no route servers — which is normal for a Tier-1 and means you buy transit rather than casually exchange traffic. Latency on Zayo's long-haul routes is competitive by construction (Spread Networks was specifically a low-latency play), and for finance and media workloads that matters.

Where it falls short

The obvious one: nothing here is self-serve, and pricing opacity is total. For a solo developer, a startup, or anyone whose need is "a server in Europe by tonight", Zayo is the wrong shape of company entirely. The procurement process is complex, the contract is long, and you will not find a comparison-friendly spec sheet with a monthly number on it.

Zayo's track record also includes service-quality incidents that enterprise buyers should ask about: the July 2022 long-haul outage that took a chunk of the US network down for hours was widely attributed to fiber cuts on Zayo routes, and enterprise forums carry recurring complaints about install delays and ticket responsiveness. None of that is unusual for a carrier of this size, but it is why we always recommend negotiating SLA credits and named escalation contacts into the contract rather than trusting the standard terms.

There is also the question of what you are actually buying after the acquisition wave. Zayo's colocation footprint, managed edge and cloud on-ramp products are layered onto a company whose centre of gravity is fiber transport. If you want a managed bare-metal server with a support chat, you want a host, not a carrier. And for APAC specifically, Zayo's presence is subsea reach and partner interconnect — not owned metro fiber in Tokyo or Singapore. Buyers targeting Asia should verify the actual last-mile partner per route.

Who should pick this

Enterprises, carriers, content providers, financial firms and AI operators buying dedicated capacity: dark fiber pairs, 100G/400G wavelengths between major metros, private network backbones, DIA at multi-gigabit speeds, or colocation cross-connects in carrier-neutral facilities. Zayo is also a mainstream wholesale supplier to other carriers and to mobile network operators for tower and small-cell backhaul. If you are choosing a private networking backbone across North America and Western Europe with genuine path diversity, Zayo belongs on the shortlist alongside Lumen, GTT, euNetworks and the strong regionals.

One procurement note we give everyone quoting with carriers: ask for the install interval in writing, ask what the demarcation looks like at each end, and price the cross-connects separately. On a two-site circuit the construction charge and the recurring cross-connect fees often move the total cost of ownership more than the monthly port price does, and Zayo's quote structure does not surface that by default. Get the LOA/CFA timeline spelled out if you are landing in a third-party data centre, and build a redundancy plan that does not share a conduit — the diversity claim is only as good as the physical route maps behind it.

We would not pick it for anything under roughly a 10 Gbps commitment or any workload that wants self-service provisioning. For single-site colocation with modest bandwidth, a regional provider or a colocation specialist will usually be faster to install and easier to work with.

For our benchmark-oriented readers, note that Zayo does not appear in our benchmarks suite: there is no standard plan to test. Its performance shows up indirectly in the transit quality of the hosts that ride on it.

Key takeaways

Tier-1 carrier (AS6461), founded 2007 in Boulder, Colorado, EQT/DigitalBridge-owned since the 2019 $14.3B take-private.
More than 240,000 route miles and 34 million fiber miles worldwide, 1,900+ connected data centres, 400+ markets — the DB's "141,000 route miles" is outdated.
No public pricing, no self-serve, no free tier, no hourly billing: every product is quote-based, multi-year, engineer-installed.
Published SLAs are specific (99.9% unprotected, 99.95% protected DIA/IP transit; 100% CloudLink guarantee), and DDoS protection is a genuine 50 Tb+ network product.
Best fit is dedicated capacity — dark fiber, wavelengths, Ethernet, private networks — between North America and Europe, not small deployments.
APAC is subsea reach and partner interconnect rather than owned metro fiber; verify per-route last mile before committing.

Sources

Pros

Tier-1 backbone: 240,000+ route miles, 11+ unique North American long-haul routes and genuine path diversity
Specific published SLAs (99.9% unprotected, 99.95% protected; 100% CloudLink guarantee) rather than marketing uptime claims
Real network-based DDoS mitigation (50 Tb+ capacity) with 24/7 NOC and SOC operations
Deep transport portfolio — dark fiber, 400G/800G wavelengths, Ethernet, IP transit, colocation — under one contract

Cons

No public pricing and no self-serve anything: quote-based, multi-year, engineer-installed
Procurement and install timelines are long; not viable for small or urgent deployments
APAC presence is subsea reach and partner interconnect, not owned metro fiber
Carrier-grade support experience is inconsistent in public enterprise forums; negotiate escalation terms

Best For

Enterprises, carriers and content operators buying dedicated transport capacity — dark fiber, 100G/400G wavelengths, private networks and colocation cross-connects — across North America and Western Europe