By Adrian James, Broadband Editor (LinkedIn) · Reviewed by Dr Alex J. Martin-Smith, Head of Editorial (LinkedIn) · Last updated 30 June 2026
In short: most familiar broadband brands, including BT, Sky, TalkTalk, Plusnet, EE, Vodafone, NOW Broadband and Zen, deliver their service over the Openreach network, which BT owns but which rivals rent. Virgin Media is the big exception, running mainly on its own cable network. A growing group of independent networks, known as altnets, build and run their own full fibre, including Community Fibre, Hyperoptic, Gigaclear and Netomnia (sold through YouFibre and brsk). Confusingly, one brand can sell over more than one network depending on your address, so the only way to know for sure is a postcode check.
Why "which network" matters more than the brand
When you buy broadband you are really buying two things: a retail service from a provider, and an underlying network that carries the signal to your home. The provider is who bills you and answers the phone. The network is the physical infrastructure in the ground and on the poles. They are often different companies, and knowing which network you are on changes four practical things: whether a provider is even available at your address, what kind of installation you will get, the top speeds on offer, and how smoothly a future switch will go.
Openreach is the largest network, and BT Group owns it. Crucially, Openreach is required to sell access to other providers on equal terms, which is why dozens of brands can offer broadband over the same lines. Full fibre coverage has climbed fast: it passed 78 percent of UK premises by July 2025 (Ofcom, Connected Nations 2025) and around 84.5 percent by mid-2026 across all networks combined (thinkbroadband, June 2026). Openreach alone is targeting 25 million full-fibre premises by the end of 2026 and 30 million by 2030 (Openreach, via thinkbroadband, 2026).
The three kinds of network in the UK
It helps to group the market into three. First, Openreach, the wholesale network most retail brands resell. Second, Virgin Media's cable network, a separate national network it owns, alongside newer full fibre it is rolling out with nexfibre. Third, the altnets, independent companies that have built their own full-fibre networks, some sold direct to you and some sold wholesale to other brands.
| Network | Examples of brands that use it | What to know |
|---|---|---|
| Openreach (owned by BT Group) | BT, EE, Plusnet, Sky, NOW Broadband, TalkTalk, Vodafone, Three Broadband, Zen and many more | The most widely available network. Brands compete on price and service over the same lines. |
| Virgin Media cable (plus nexfibre full fibre) | Virgin Media; nexfibre full fibre is also sold wholesale, for example to giffgaff in selected areas | Virgin's own network, not Openreach. Often fast, but availability is street by street. |
| CityFibre (wholesale full fibre) | Vodafone, Sky, TalkTalk, Zen, 4th Utility, Lit Fibre, Cuckoo, toob, Pop Telecom and others | A wholesale altnet. Several familiar brands sell over it where it is built. |
| Independent altnets (own networks) | Community Fibre, Hyperoptic, Gigaclear, G.Network, B4RN, Netomnia (via YouFibre and brsk) and others | Build and run their own fibre, usually in specific towns, cities or rural areas. |
Two important caveats sit behind that table. A single brand can appear in more than one row: Zen, for example, sells over both Openreach and CityFibre, and Vodafone sells over Openreach, CityFibre and nexfibre depending on where you live. And the lists are examples, not a fixed or complete map, because wholesale arrangements change as networks expand and consolidate. That is exactly why a live address check beats any printed list.
One geographical exception is worth knowing. In Hull and parts of East Yorkshire the local network is run by KCOM, not Openreach, so the brands and the rules there differ from the rest of the country. The Crown Dependencies sit outside Openreach too: the Isle of Man is served by Manx Telecom, Jersey by JT and Guernsey by Sure. If you live in any of these places, the "is my provider on Openreach" question has a different answer, because Openreach simply does not operate there.
Check which networks and providers reach your postcode
"Is Sky on Openreach?" and other common questions
Some of the most searched questions are simply people checking the network behind a brand. Sky and BT are the two largest providers that run on Openreach, so a Sky Full Fibre line and a BT Full Fibre line use the same underlying network and, at the same speed tier, deliver very similar performance (BroadbandSwitch.uk, BT vs Sky comparison). TalkTalk, Plusnet, EE, NOW Broadband and Vodafone's Openreach products work the same way. This is why cheaper Openreach resellers can match the performance of pricier ones on the identical line: you are paying for the retail brand and its extras, not a different network.
Why it matters when you switch
The network behind your service shapes how a switch feels. Moving between two Openreach providers is usually a quick, remote change with little or no downtime, because nothing physical needs to alter. Moving across networks is different: going from Virgin Media cable to an Openreach line, or to an altnet, generally means a new connection and often an engineer visit, although the two services can frequently run in parallel so you are not left without internet. We cover that in detail in our guide to switching from Virgin Media to Openreach with the least downtime, and the mechanics of the switch itself in our One Touch Switch guide.
Knowing your network also helps when something goes wrong. Your provider is always your first point of contact for a fault, even when the physical problem sits with Openreach or another network operator. And if you are weighing up an altnet, it is worth understanding what happens to your service if that company is acquired or restructured, which we explain in our guide to what happens if your altnet goes bust.
How to find out for certain
You cannot reliably tell which networks reach your home from a brand name alone, because coverage varies street by street, especially across altnet builds. Run a postcode availability check to see which networks and providers are live at your exact address, then compare the deals on each. If you want to sense-check your current line first, you can run a free Pulse speed test to see what you are getting today.
Compare providers at your postcode
Frequently asked questions
Is BT the same as Openreach?
BT Group owns Openreach, but they are run separately. Openreach builds and maintains the network and sells access to many providers, while BT is one of those retail providers buying access alongside Sky, TalkTalk, Plusnet, EE, Vodafone and others.
Is Sky on the Openreach network?
Yes, Sky's main broadband products run over Openreach, the same network BT uses. In some areas Sky also sells faster tiers over the CityFibre network. At the same speed, a Sky Openreach line performs much like a BT one because the underlying network is identical.
Does Virgin Media use Openreach?
No. Virgin Media runs mainly on its own cable network, which is separate from Openreach, and it is rolling out additional full fibre with nexfibre. This is why switching to or from Virgin Media usually involves a new connection rather than a simple line change.
What is an altnet?
An altnet, or alternative network, is a company that has built its own full-fibre network rather than reselling Openreach. Examples include Community Fibre, Hyperoptic, Gigaclear and Netomnia. Some sell direct to customers and some sell wholesale to familiar brands.
Can two providers use the same network?
Yes, and most do. Many brands share the Openreach network, and several also share CityFibre. A single brand such as Zen or Vodafone can even sell over more than one network depending on your address.
How do I find out which network reaches my home?
Run a postcode availability check, because coverage varies street by street and a brand name alone will not tell you. The check shows which networks and providers are live at your exact address so you can compare the deals on each.
Sources
- Ofcom. (2025). Connected Nations 2025 (full fibre passed 78 percent of UK premises by July 2025). Retrieved 30 June 2026.
- thinkbroadband. (2026, June). UK full fibre coverage and timelines (footprint reached approximately 84.5 percent of UK premises by mid-2026). Retrieved 30 June 2026.
- Openreach, via thinkbroadband. (2026). Full-fibre build targets of 25 million premises by end of 2026 and 30 million by 2030. Retrieved 30 June 2026.
- BroadbandSwitch.uk. BT vs Sky broadband; Switching from Virgin Media to Openreach with least downtime. Retrieved 30 June 2026.
Network and wholesale arrangements change as builds expand and the market consolidates. Brand examples are illustrative, not a complete or guaranteed map. Always run a postcode check for your exact address.