In London, Tier 1 ISPs, also known as backbone or global transit ISPs, are the highest-tier ISPs that have direct connections to the global internet backbone. These ISPs operate at the core of the internet infrastructure and provide connectivity to other ISPs and networks.  Understanding Tier 1 ISPs is critical when designing a global business network using the internet .  The team at Macronet Services can help you select the best ISP options in London and assist with optimized network design solutions for your business.

Some global Tier 1 ISPs that have a presence in London include:

  • AT&T (AS 7018)
  • LUMEN (AS 3356)
  • GTT Communications (AS 3257)
  • NTT (AS 2914)
  • Arelion (AS 1299)
  • Colt (AS 8220)

These Tier 1 ISPs maintain extensive networks of high-capacity fiber optic cables and peering agreements with other ISPs, allowing them to transmit data across long distances with minimal latency.  Sample Tier 1 global latency examples can be found at this link. Their presence in London is crucial for ensuring robust internet connectivity for businesses and individuals in the region.

For a detailed guide to selecting global ISPs, click HERE.

London is home to several reputable ISPs, each offering a range of services to suit different needs and budgets. Some of the top ISPs in London include:


BT is one of the largest ISPs in the UK, offering a wide range of broadband and mobile services. With fast speeds and reliable connectivity, BT is a popular choice for both residential and business customers.

Virgin Media

Virgin Media is known for its high-speed broadband and cable TV services. With fiber-optic technology, Virgin Media offers some of the fastest internet speeds available in London.

Sky Broadband

Sky Broadband offers a range of broadband packages tailored to different needs, including standard ADSL and high-speed fiber-optic options. With competitive pricing and reliable service, Sky Broadband is a popular choice for many Londoners.


TalkTalk is another leading ISP in London, offering affordable broadband and phone services to residential customers. With flexible packages and excellent customer support, TalkTalk is a reliable choice for those on a budget.


EE is known for its mobile network, but it also offers broadband services with fast speeds and reliable connectivity. With competitive pricing and comprehensive coverage, EE is a popular choice for customers looking for both mobile and broadband services.


Plusnet offers a range of broadband packages with competitive pricing and excellent customer service. With straightforward pricing and reliable connectivity, Plusnet is a popular choice for residential customers in London.

Comparison of Top ISPs

When comparing the top ISPs in London, several factors should be considered, including global network coverage, speed, and customer satisfaction.  Peering is a top consideration, particularly for global businesses that might run critical applications that need to operate within latency parameters.  Some ISPs have add-on product offerings including network-based DDoS protection that can be critical for sites requiring high-availability.


Check the coverage maps provided by each ISP to ensure that they offer service in your area. Some ISPs may have better coverage in certain parts of London than others.   Low Earth Orbit satellite services are now a viable option as well.


Compare the internet speeds offered by each ISP to determine which one best meets your needs. Consider factors such as download and upload speeds, as well as any data caps or restrictions that may apply.  Broadband offerings might meet your requirement whereas many larger businesses require dedicated internet access.

Customer Satisfaction

Research customer reviews and ratings to gauge the level of satisfaction among existing customers. Look for ISPs with high ratings for reliability, customer service, and overall satisfaction.


Choosing the right ISP is essential for ensuring a fast, reliable internet connection. Consider factors such as speed, pricing, and customer service when comparing different providers. By doing your research and weighing your options carefully, you can find the best ISP to meet your needs in London.  The team at Macronet Services can assist with all aspects of designing your global network.  Click HERE for a Comprehensive WAN RFP Template or contact us anytime for a conversation about your objectives.