Company lists · Data refreshed September 2026
Top 25 Internet service providers based in the United Kingdom
Find 357 internet service providers based in the United Kingdom, with company records and 20,820 contacts, including 6,660 email addresses. The list was updated in September 2026 and includes providers across the market, with London as the single most-represented city. Use it to research potential vendors, partners, and sales prospects.
Internet service providers are companies that provide internet access to households, businesses, public organizations, or other customers through wired, wireless, fiber, cable, satellite, or other network connections. This list covers companies that provide internet access services directly to residential, commercial, government, or institutional customers. Ranked by team size, largest first. Data current as of September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest internet service providers based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 6,839 contacts → | ||||
Indirect evidence “We’re in the process of growing all parts of our business so we can connect more customers to the things and to the people they care about.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,460 contacts → | ||||
Indirect evidence “At CityFibre, we’re building a new, intelligent, open-access fibre network, purpose built for the data age.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,295 contacts → | ||||
Indirect evidence “Hyperoptic was founded in 2011 to shake up the broadband market, and we're proud to be forever in our customers' corner.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 521 contacts → | ||||
Indirect evidence “Zen is a B Corp certified telecommunications and technology service provider in the UK.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 483 contacts → | ||||
Indirect evidence “Whichever way you look at it, we are London’s best broadband- London's fastest broadband network - London’s best quality broadband network (Opensignal)*- Which?” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 362 contacts → | ||||
Indirect evidence “euNetworks (@euNetworks) is a European provider of bandwidth infrastructure services.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 326 contacts → | ||||
Indirect evidence “Our mission is to bring Full Fibre broadband to homes and businesses across Northern Ireland and Great Britain, especially to those who need it most.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 310 contacts → | ||||
Indirect evidence “When it comes to business, there’s no city like London.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 304 contacts → | ||||
Indirect evidence “Broadband built for you” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 278 contacts → | ||||
Indirect evidence “Get a better kind of broadband from YouFibre YouFibre is a full fibre broadband provider on a mission to bring gigafast broadband speeds to our customers.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 262 contacts → | ||||
Indirect evidence “We’re here to power the ambitions of London enterprises with a dedicated 100Gbps fibre network, managed IT and cybersecurity services.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 250 contacts → | ||||
Indirect evidence “Zzoomm is here to build a Full Fibre broadband network in your town; fit for the future, for everyone, right now.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 226 contacts → | ||||
Strong evidence “Founded in 2009, Airband is an independent internet service provider bringing superfast broadband to homes, business and industry in rural and hard-to-reach areas, with a rapidly…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 217 contacts → | ||||
Strong evidence “ASK4: Empowering connected living and working spaces Specialist managed Internet service provider for multi-tenant buildings.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 203 contacts → | ||||
Strong evidence “toob is a full-fibre broadband provider on a mission to bring fast, affordable and reliable internet for homes and businesses across England and Scotland.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 191 contacts → | ||||
Indirect evidence “Welcome to Glide, the UK's leading business broadband provider specialising in hard-to-reach and difficult-to-serve locations.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 190 contacts → | ||||
Indirect evidence “Technetix provides critical broadband infrastructure for network operators globally.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 138 contacts → | ||||
Indirect evidence “Welcome to Nano Fibre UK!” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 134 contacts → | ||||
Indirect evidence “CASS (Cabling and Splicing Services) is a services driven telecommunications specialist business.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 126 contacts → | ||||
Indirect evidence “At Truespeed, we're on a mission to bring ultrafast, full fibre broadband to homes, businesses and communities across the South West.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 124 contacts → | ||||
Indirect evidence “As a UK fibre network provider, we believe that high-speed broadband should be available for everyone.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 122 contacts → | ||||
Indirect evidence “Founded in 1994, Commsworld is a leading UK Telecommunications Network Provider and ISP and supports thousands of the UK’s leading organisations, both in public and private…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 115 contacts → | ||||
Indirect evidence “Sparta Telecom was established in Luton Bedfordshire in 2011.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 99 contacts → | ||||
Indirect evidence “Spitfire Network Services is a UK-based, multi-award winning telecoms and ISP provider for businesses.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 92 contacts → | ||||
Strong evidence “Jurassic Fibre is a Devon based independent telecommunications company taking the internet experience for families and businesses to a whole new level.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: internet service providers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names internet service providers.
- Partial evidence
- Its own public description names part of internet service providers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name internet service providers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 357 internet service providers based in the United Kingdom
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 6,660 reachable decision-makers.
Free signup · no credit card
Internet service providers based in the United Kingdom at a glance
As of Sep 6, 2026Companies by employee count
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among internet service providers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “internet service providers”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names internet service providers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among internet service providers, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 6,660 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 6, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Internet service providers by metro
Frequently asked
How many internet service providers are based in the United Kingdom?
RevenueBase counts 357 internet service providers listed based in the United Kingdom. The directory also includes 20,820 contacts and 6,660 email addresses.
What does an internet service provider do?
An internet service provider delivers internet access to customers through network connections such as fiber, cable, wireless, or satellite. Providers may serve residential, business, government, or institutional customers.
Which city has the most internet service providers in the list?
London is the single most-represented city among the internet service providers on the list. The list was updated in September 2026.
Ready to reach these companies? Verified emails and direct dials for all 357 internet service providers based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Internet service providers by geography
- Internet service providers based in Brazil
- Internet service providers based in the United States
- Internet service providers based in South Africa
- Internet service providers based in Spain
- Internet service providers based in Canada
- Internet service providers based in Italy
- Internet service providers based in Germany
- Internet service providers based in France
- Internet service providers based in Argentina
- Internet service providers based in Poland
- Internet service providers based in Australia
- Internet service providers based in the Netherlands
About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Internet service providers based in Brazil
- Internet service providers based in the United States
- Internet service providers based in South Africa
- Internet service providers based in Spain
- Internet service providers based in Canada
- Internet service providers based in Italy