Superfast, ultrafast and gigabit: what they mean

There is no single legal dictionary of broadband speed names. Several bodies use the terms for different jobs, which is why you sometimes see different thresholds for the same word.

• Ofcom groups fixed broadband by the download speed a connection can provide in its annual Connected Nations reports, which track coverage across the UK. Its figures are widely reported, for example by the specialist news site ISPreview.
• The government (through BDUK) sets its own definitions on the GOV.UK Project Gigabit page, because it uses them for funding and targets. It notes plainly that broadband providers may use different terminology when advertising their services.
• The law fixes one band precisely. The broadband universal service obligation (USO), the right to request a decent connection, is set out in a 2018 Order. Its specification asks for a download speed of at least 10 megabits per second, upload of at least 1 megabit per second, a contention ratio (how many users share capacity) no higher than 50:1, latency good enough for voice calls and at least 100GB of data a month. Ofcom's "decent" band reflects these speeds. Our guide to the broadband universal service obligation covers how to use that right.
• Providers name their own packages. Words like "superfast", "ultrafast" or "gigabit" in a package name are marketing, not a regulated band. Advertising itself is policed by the Advertising Standards Authority (ASA), not Ofcom.

One rule does help you here. Ofcom's rules for providers (its General Conditions), as explained in guidance it has enforced since 16 September 2024, mean providers must give a short description of each product's underlying technology, such as full fibre, part fibre or cable, at the point of sale and in your contract information. That description is often more useful than the speed label, because the technology decides which bands are possible at all.

The table puts the two main sets of definitions side by side. Speeds are download speeds, and they describe what the line or network can offer, not the package you choose.

A quick note on units. Broadband speeds are measured in megabits per second, written Mbps (Ofcom writes Mbit/s). There are 1,000 megabits in a gigabit, so 1Gbps is the same as 1,000Mbps. Our guide to broadband speed units explains how these figures relate to file sizes and download times.

"Decent" is not a word you will see in many adverts, but it matters because it is the minimum the UK treats as an acceptable home connection. Ofcom says 10Mbps is enough for a high-definition video call, and that a one-hour HD TV episode of about 1GB would take almost 15 minutes to download at that speed.

Ofcom says decent speeds can be delivered by every fixed technology, including ADSL, the oldest copper-only broadband. ADSL tops out at up to 24Mbps and slows as the line gets longer, so a home on a long ADSL line can fall below 10Mbps; that gap is what the universal service obligation addresses. GOV.UK says ADSL will be phased out by 31 January 2027 as part of the retirement of the old copper phone network. If your home only gets ADSL-level speeds today, see our guide to slow broadband on long lines for what can be done.

Superfast starts at 30Mbps download: Ofcom counts at least 30Mbps, and the government's definition is over 30Mbps. In practical terms, Ofcom says superfast is enough for one person to stream 4K (ultra-HD) video, and that at these speeds several devices can work at the same time. It also says a one-hour HD episode downloads in under four and a half minutes. GOV.UK gives its own example: a 4GB HD film takes around 18 minutes to download at 30Mbps.

Three technologies can deliver superfast speeds:

• Part fibre (FTTC, fibre to the cabinet): fibre runs to the street cabinet and the old copper phone line covers the last stretch to your home. Ofcom says the maximum download is normally up to 80Mbps, and Openreach says its own FTTC service offers up to 76Mbps down and 15Mbps up. Because speeds over the copper section fall with the length of the line, a home far from its cabinet can get noticeably less.
• Cable (HFC): fibre to a street cabinet, then coaxial cable into the home.
• Full fibre (FTTP): fibre all the way to your property.

Whether superfast is enough for you depends on how many people are online at once and what they do. Our guide on what broadband speed you need walks through that household by household. If you are on part fibre and want to see whether something faster is available, the fibre broadband deals page compares packages at your postcode.

Ultrafast is where most confusion comes from, because the two main bodies drew the line in different places.

• Ofcom originally treated ultrafast as 100Mbps and above, then raised it to 300Mbps and above in its Connected Nations 2015 report. ISPreview's reporting shows Ofcom was still using 300Mbps for ultrafast in its summer 2021 update.
• The government defines ultrafast as over 100Mbps on its Project Gigabit page.
• Ofcom's Connected Nations 2025 report no longer has an ultrafast band. Its categories are decent, superfast and gigabit-capable.

The result is that "ultrafast" on its own tells you only that a service is somewhere above 100Mbps, or above 300Mbps, depending on who is using the word. GOV.UK also says that fixed wireless access (broadband delivered by radio, including 4G and 5G home broadband) typically provides superfast or ultrafast speeds and sometimes gigabit speeds, and that some satellite services now offer ultrafast broadband. So the word does not even tell you whether the connection is wired.

What to do with it: ignore the label and look for the number. When you compare deals, check the stated download speed in Mbps, the upload speed (see download vs upload speed) and the technology description. Two packages both called "ultrafast" can be very different.

Gigabit-capable means a connection that can deliver download speeds of at least 1Gbps, which is 1,000Mbps. Ofcom and the government agree on this figure. Ofcom says that at gigabit speeds a one-hour HD episode downloads in about eight seconds and a full 4K film of 100GB in under 15 minutes; GOV.UK's example is a 4GB HD film in 30 seconds.

Two technologies count:

• Full fibre (FTTP): because the whole path from the exchange to your home is fibre, Ofcom says distance generally does not affect the speed. Openreach says its full fibre offers download speeds of up to 1,600Mbps. Our guide to what full fibre broadband is covers installation, equipment and how it differs from part fibre.
• Cable (HFC) upgraded to DOCSIS 3.1 or later: in the UK this is Virgin Media O2's network, explained below.

Some networks now sell packages faster than 1Gbps. Openreach's full fibre goes up to 1,600Mbps and, as noted above, Virgin Media lists a 2,130Mbps cable package. These still sit in Ofcom's gigabit-capable band, which has no upper limit.

Getting those speeds to a device is a separate problem. A device plugged into a 1Gbps Ethernet port cannot receive more than 1Gbps through it, so port speeds matter. Virgin Media's own equipment shows the variation: its Hub 5 has one 2.5Gbps Ethernet port alongside three 1Gbps ports, while the Hub 5x has one 10Gbps port and three 1Gbps ports. If you are considering a multi-gigabit package, read our guide to building a multi-gigabit home network first, so you know what your router, cabling and devices need to make use of it.

Ofcom's Connected Nations 2025 report, published on 19 November 2025, is the latest full annual release used here. Its main coverage figures are for UK residential premises as of July 2025; where a figure counts all premises, including businesses, we say so.

• Superfast: 98% of UK residential premises (about 29.7 million) could get superfast fixed-line broadband.
• Gigabit-capable: 87% (26.4 million) could get a gigabit-capable connection, up four percentage points on July 2024.
• Full fibre: 78% (23.7 million) had full fibre available, up from 69% in July 2024.
• Choice of gigabit network: 57% could get more than one gigabit-capable network, up from 47% a year earlier.
• Below decent: around 44,000 premises (this figure counts all premises, not only homes) could not get decent broadband (10Mbps) from either a fixed line or fixed wireless. As reported by ISPreview, Ofcom's January 2026 update put this at 39,000, or 0.1% of the UK.

Two things stand out. First, the gap between town and country is far bigger for gigabit and full fibre than for superfast. Second, the gap between gigabit-capable and full fibre is mostly cable: where Virgin Media's upgraded network reaches, homes count as gigabit-capable without having full fibre. The same report also looks at the services people actually use. The UK's average maximum download speed of home connections in use rose from 223Mbps in 2024 to 285Mbps in 2025, which ISPreview's summary puts down to customers moving to faster services, and 10.6 million premises (homes and businesses) had taken up full fibre. That is a measure of what people buy, not of what is available to them.

Coverage keeps moving. Ofcom published a smaller interim update in spring 2026 (published May 2026, using January 2026 data), the most recent Ofcom coverage figures we found when this guide was last checked in October 2026. As reported by ISPreview, it put gigabit-capable coverage at 89% and full fibre at 82% of homes, with superfast unchanged at 98%.

The government expects 99% of UK premises to have access to gigabit-capable broadband by 2032. Most of that comes from providers' own rollouts; Project Gigabit funds the places outside their commercial plans. The Gigabit Broadband Voucher Scheme (vouchers worth up to £4,500 per premises) closed to new projects on 31 August 2026; only premises already in an existing voucher project can still benefit, with delivery running until March 2028 at the latest (GOV.UK, updated 2 September 2026). Our guide to Project Gigabit explains how the programme decides which areas it funds.

National percentages tell you little about your own front door, because Ofcom counts coverage premises by premises. These steps give you a reliable picture of your address.

1. Check the networks at your address. GOV.UK points people to Ofcom's website to check the speeds available at an address. Network operators' own checkers can also help; our guide on how to check full fibre availability explains which checkers to use and how to read the results.
2. Compare by postcode. Put your postcode into the comparison on our broadband deals page. The partner widget shows deals offered at your postcode, so you can see in one place whether full fibre, cable or part fibre packages are on offer, and at what advertised speeds. Our broadband deals by area pages give a local starting point too.
3. Read the technology description. Before you sign, look for the short technology description providers have to give at the point of sale and in your contract information: full fibre, part fibre or cable. Full fibre, or Virgin Media cable (which Ofcom says delivers gigabit speeds), means your line is in the gigabit-capable band, even if the package you choose is slower.
4. Look at the speed estimate for your line. For part fibre especially, the speed you can get depends on your line. Ofcom says that providers signed up to its voluntary broadband speeds code of practice (including BT, EE, Sky, TalkTalk and Virgin Media) should give you, before you buy and without you asking, an estimate of the speed you are likely to get at busy times and a minimum guaranteed speed. Use that estimate rather than the package name; our guide to the broadband minimum speed guarantee explains what happens if your speed falls below it.
5. Test what you get now. Run the speed test on our broadband speed test page, ideally on a device connected to the router by an Ethernet cable (Ofcom's advice, because Wi-Fi can slow the result), to see what your current connection delivers. Comparing that with the bands above tells you whether an upgrade would make a real difference.

Questions worth asking a provider

• Is this package full fibre, part fibre or cable at my address?
• What download and upload speeds do you estimate for my line?
• If the package is called superfast, ultrafast or gigabit, what speed in Mbps does that mean?
• Does the router you supply have the ports and Wi-Fi to carry the speed I am paying for?

Once you know your band, choosing gets simpler. If you are in a gigabit-capable area, compare fibre broadband deals across a range of speeds rather than assuming you need the fastest. If superfast is the best your home can get, the question becomes which part fibre package suits your use, and whether a faster network is planned for your area. You can also browse the broadband providers we cover to see which networks each one uses.