Which companies provide core internet infrastructure and services?

Core internet infrastructure and services are handled across several distinct layers, ranging from physical global fiber-optic cables and backbone networks to Domain Name System (DNS) roots, data centers, and cloud hyperscalers.

The primary companies and organizations providing these foundational layers include:

1. Tier-1 Internet Service Providers (Backbone Networks)

Tier-1 networks own the massive, high-capacity global fiber optic "pipes" and exchange traffic with each other via settlement-free peering—meaning they don't buy transit from anyone else to reach the rest of the internet.

• Arelion (formerly Telia Carrier): Operates one of the largest global internet backbones.
• Lumen Technologies (incorporating the legacy Level 3 Communications network): Massive global enterprise and IP backbone provider.
• Cogent Communications: One of the largest facilities-based ISPs in the world, carrying a massive percentage of global internet traffic.
• AT&T & Verizon: Major U.S. and global telecommunications giants running critical Tier-1 IP backbones.
• NTT: Operates a massive global Tier-1 backbone spanning Asia, the Americas, and Europe.
• Other notable international Tier-1 networks: Tata Communications, GTT Communications , and Zayo Group.

2. Cloud Hyperscalers & Content Delivery Networks (CDNs)

Much of the modern "logical" core—hosting, edge caching, and content delivery—has shifted to massive distributed cloud platforms and edge networks.

• Amazon Web Services (AWS): The market leader in global cloud infrastructure (IaaS/PaaS).
• Microsoft Azure: Major global enterprise cloud infrastructure provider.
• Google Cloud Platform (GCP): Operates its own private global fiber network interconnecting massive data centers worldwide.
• Cloudflare & Akamai Technologies: Critical edge infrastructure providers that secure, optimize, and deliver a massive slice of global web traffic.

3. Domain Name System (DNS) and Registry Services

The system that translates human-readable web addresses into machine-readable IP addresses relies on root and top-level domain (TLD) infrastructure.

• Verisign: Manages the authoritative registry for critical TLDs like .com and .net , alongside operating two of the 13 global root DNS servers (A and J).
• ICANN (Internet Corporation for Assigned Names and Numbers): The non-profit multi-stakeholder organization responsible for coordinating the maintenance and procedures of namespaces across the internet.

4. Submarine Cable & Physical Real Estate (Colocation)

• Subsea Cable Consortia/Owners: Companies like SubCom, NEC , and joint ventures involving tech giants (Google, Meta, Microsoft) lay transoceanic fiber cables.
• Equinix & Digital Realty: Provide the carrier-neutral data center real estate and Internet Exchange Points (IXPs) where networks physically interconnect.

Would you like to explore how traffic moves between these tiers (peering vs. transit) or look into the infrastructure of a specific layer like subsea cables or DNS?

The internet is not run by one company. It is a layered ecosystem of network operators, cloud providers, data-center companies, DNS operators, content delivery networks (CDNs), security providers, and domain infrastructure organizations. Some of the most important companies include:

1. Global internet backbone and transit providers

These companies operate high-capacity fiber networks, submarine cables, routers, and interconnections that move traffic between networks.

• Arelion — Operates a major global IP backbone used by enterprises, carriers, and cloud providers.
• Lumen Technologies — Provides long-haul fiber, enterprise networking, and internet connectivity.
• Cogent Communications — Runs a large global IP network connecting many organizations and carriers.
• Zayo Group — Provides fiber, bandwidth, and data-center connectivity infrastructure.
• NTT Communications — Operates global network and data infrastructure.

2. Cloud infrastructure providers

These companies provide the servers, storage, databases, and computing platforms that power many websites and applications.

• Amazon Web Services — One of the largest cloud infrastructure providers, offering compute, storage, networking, and managed services.
• Microsoft Azure — Provides global cloud infrastructure and enterprise services.
• Google Cloud — Provides cloud computing, networking, and data services.
• Oracle Cloud Infrastructure — Provides enterprise cloud infrastructure.
• Alibaba Cloud — Major cloud provider in Asia and globally.

3. Data centers and internet exchange infrastructure

These companies provide the physical locations where networks, servers, and cloud systems connect.

• Equinix — Operates many carrier-neutral data centers where networks exchange traffic.
• Digital Realty — Provides large-scale data center infrastructure.
• CoreSite — Provides data-center ecosystems connecting cloud, network, and enterprise providers.

4. DNS and domain-name infrastructure

DNS translates human-readable names (like example.com) into IP addresses.

• Verisign — Operates critical DNS infrastructure, including the registry for .com and .net domains.
• Internet Corporation for Assigned Names and Numbers (ICANN) — Coordinates global domain names and IP address allocation systems.

5. Content delivery networks (CDNs) and edge infrastructure

CDNs place servers around the world to deliver websites, video, and applications faster.

• Cloudflare — Provides CDN, DNS, DDoS protection, edge computing, and internet security services.
• Akamai Technologies — One of the oldest and largest CDN and edge-security providers.
• Fastly — Provides programmable edge computing and content delivery.
• Amazon CloudFront — AWS’s CDN service.
• Google Cloud CDN — Google’s CDN offering.

6. Networking equipment companies

These companies make much of the hardware that runs internet infrastructure.

• Cisco Systems — Major supplier of routers, switches, and network security equipment.
• Arista Networks — Supplies high-performance switches used in cloud and data-center networks.
• Juniper Networks — Produces routers and network infrastructure equipment.

7. Consumer access networks (ISPs and mobile carriers)

These connect homes, businesses, and phones to the wider internet.

Examples include:

• Comcast
• Verizon Communications
• AT&T
• Deutsche Telekom
• China Telecom

A simplified view

Users
  ↓
ISPs / Mobile Networks
  ↓
Internet Backbone Providers
  ↓
Internet Exchanges + Data Centers
  ↓
Cloud Providers + Hosting Companies
  ↓
CDNs + Edge Networks
  ↓
Websites, Apps, Streaming, APIs

No single company "owns the internet." Instead, thousands of autonomous networks interconnect through agreements, internet exchanges, and shared standards. gsma.com The companies above are among the organizations with the largest roles in keeping global connectivity running.

Core internet infrastructure and services span several layers, ranging from physical backbone networks and submarine cables to domain name systems and cloud data centers.

The primary categories and the key companies powering them include:

• Tier 1 Internet Service Providers (ISPs) & Backbone Operators own the global fiber-optic networks that transit data globally without purchasing transit from anyone else. Key players include:
  • Lumen Technologies (formerly CenturyLink/Level 3)
  • AT&T Business
  • Verizon Enterprise
  • Cogent Communications
  • NTT Global
  • Tata Communications
• Cloud & Content Delivery Networks (CDNs) cache data closer to users and host foundational web infrastructure:
  • Cloudflare (edge security, DNS, and CDN)
  • Amazon Web Services (AWS) (massive global cloud infrastructure)
  • Microsoft Azure
  • Google Cloud
  • Akamai Technologies (pioneering CDN and edge architecture)
• Data Centers & Interconnection Facilities house the physical servers and cross-connect networks where traffic is exchanged:
  • Equinix (operates critical International Business Exchange data centers)
  • Digital Realty
  • CoreSite
• Domain Name System (DNS) & Registry Services manage how human-readable addresses map to machine-readable IP numbers:
  • Verisign (manages the registry for .com and .net)
  • ICANN (the non-profit coordinating the global DNS namespace)

Would you like to explore a specific layer in more detail, such as how Tier 1 peering works or the role of submarine cable systems?

If by “core internet infrastructure and services” you mean the companies that provide the underlying networks, data centers, DNS, cloud, CDN, and connectivity that make the Internet work, it’s a fairly broad ecosystem. The Internet Society similarly breaks infrastructure into areas such as submarine/terrestrial networks, satellite networks, IXPs, CDNs, and data centers.

Major categories and companies

A useful way to think about the most strategically important companies is:

Lumen / NTT / Arelion → Equinix → AWS / Azure / Google Cloud → Cloudflare / Akamai → ISPs → users

But these layers overlap heavily. For example, Amazon, Google, Microsoft, Meta and Cloudflare operate enormous private networks rather than simply buying Internet connectivity like a conventional company. Current IXP data shows Amazon, Akamai, Meta, Cloudflare, Microsoft and Fastly among the largest networks participating in North American exchanges.

The companies I'd consider most "core"

If you're asking because you're trying to identify the companies with the greatest structural importance to the Internet, I'd put particular attention on:

• Cloudflare — DNS, CDN, security, edge networking and Internet connectivity.
• Akamai — enormous global content-delivery and edge network.
• Equinix — critical physical interconnection layer between networks and clouds.
• Lumen — major long-haul fiber/IP backbone.
• NTT — major global backbone and transit network.
• Arelion — major global IP backbone.
• AWS, Microsoft and Google — enormous private global networks plus cloud infrastructure.
• Verisign — particularly important to the DNS/domain-name system; it operates .com and .net and performs key root-zone functions.
• AT&T and Verizon — major U.S. access and backbone networks.
• Cisco and Nokia — crucial suppliers of the physical networking equipment used by carriers and data centers.

Equinix's current network documentation, for example, lists providers including Lumen, Sparkle and Telxius in various markets, illustrating how these backbone operators feed into the interconnection ecosystem.

If your question is investment-oriented, I can also narrow this down to the 20 publicly traded companies that are most critical to Internet infrastructure, including their market caps, revenue exposure, moats, and which parts of the Internet they control.

But these layers overlap heavily. For example, Amazon, Google, Microsoft, Meta and Cloudflare operate enormous private networks rather than simply buying Internet connectivity like a conventional company. Current IXP data shows Amazon, Akamai, Meta, Cloudflare, Microsoft and Fastly among the largest networks participating in North American exchanges.

The companies I'd consider most "core"

If you're asking because you're trying to identify the companies with the greatest structural importance to the Internet, I'd put particular attention on:

If by “core internet infrastructure” you mean the companies that operate the networks, data centers, interconnections, backbone capacity, DNS/CDN infrastructure, and cloud systems that make the Internet work, there isn't one single group. The ecosystem is layered. The Internet Society describes infrastructure providers as including operators of terrestrial and submarine networks, satellite networks, Internet exchanges, CDNs, and data centers.

Major companies by layer

The particularly important “core” players

If you're trying to identify the smallest set of companies that have an outsized role in the Internet's underlying infrastructure, I'd pay particular attention to:

• Lumen, Arelion, Cogent, NTT and Tata Communications — backbone and IP transit.
• Equinix and Digital Realty — physical interconnection points and data centers.
• Cloudflare, Akamai and Fastly — enormous distributed edge/CDN networks.
• AWS, Microsoft and Google — hyperscale cloud networks that increasingly function as private Internet backbones.
• Cisco, Nokia, Juniper and Ciena — the equipment underneath many of those networks.
• Verisign — especially important to the domain-name infrastructure.
• Major telecom operators such as AT&T, Verizon, Deutsche Telekom, Orange, Telefónica and China Telecom — access networks plus large national/international backbones.

A useful distinction is that AWS/Google/Microsoft aren't merely “cloud companies” anymore. Their networks are deeply embedded in the Internet's physical and routing infrastructure. Recent Internet-exchange data, for example, shows Amazon, Microsoft and Google among the largest participants alongside Akamai, Cloudflare and Hurricane Electric.

If your question is really about “Who are the companies that control the Internet's backbone and could be considered strategic infrastructure?”, I can also give you a ranked top 20, including what each owns/operates and how difficult it would be to replace them.

Core internet infrastructure encompasses a multi-layered ecosystem spanning global fiber backbones, Domain Name System (DNS) authorities, content delivery networks (CDNs), and massive data center real estate.

The primary companies and organizations powering these foundational layers include:

• Tier 1 Internet Backbone Providers: These companies own and operate the global fiber-optic networks that carry traffic across continents without purchasing transit from anyone else. Key players include Arelion, Lumen Technologies, Cogent Communications, NTT Global Networks, Verizon Enterprise Solutions, AT&T, Tata Communications , and Zayo Group.
• Domain Name System (DNS) and Registry Operators: These entities manage the root name servers and top-level domains that translate human-readable URLs into numerical IP addresses. Prominent organizations include Verisign (which manages the .com and .net registries) and ICANN (the non-profit coordinator of the global DNS architecture).
• Content Delivery Networks (CDNs) & Cloud Edge Infrastructure: These providers cache and distribute data globally to reduce latency and block massive cyberattacks (like DDoS). Market leaders include Cloudflare, Akamai Technologies , and Fastly.
• Hyperscale Cloud & Data Center Providers: The physical housing and computing engines for modern internet traffic are heavily centralized through massive data center and cloud operators like Amazon Web Services (AWS), Microsoft Azure, Google Cloud , and colocation giants like Equinix and Digital Realty.
• Telecom Equipment Manufacturers: The hardware (routers, switches, and cellular base stations) running these networks is primarily manufactured by companies like Cisco Systems, Huawei, Ericsson , and Nokia.

Would you like to explore how Tier 1 peering works , or dive deeper into the role of subsea cable networks in global routing?

The companies that provide core internet infrastructure and services include global telecommunications backbone operators, networking hardware manufacturers, data center real estate providers, and cloud hyperscalers.

If you'd like, let me know:

• Are you looking for companies operating in a specific geographic region?
• Do you need information on a specific layer (like undersea cables or DNS providers)?

I can narrow down the details for you.

If by “core internet infrastructure and services” you mean the companies that provide the networks, facilities, cloud platforms, interconnection, and delivery systems underneath the public Internet, it’s a fairly broad ecosystem. No single company “runs the Internet.”

Major categories and companies

• Global backbone / Tier-1 network operators — own large long-haul fiber networks and routers and sell connectivity to other networks:

• AT&T

• Verizon

• Lumen

• NTT

• Tata Communications

• Telia Carrier/Arelion

• Zayo

• GTT

• Deutsche Telekom

• Orange

• Singtel

• Telstra Tier-1 networks form much of the underlying global routing infrastructure.

• Cloud and hyperscale infrastructure — provide enormous amounts of computing, storage, networking and increasingly their own private Internet backbones:

• Amazon Web Services (AWS)

• Microsoft Azure

• Google Cloud

• Oracle Cloud

• Alibaba Cloud

• IBM Cloud

• Tencent Cloud These companies are increasingly infrastructure operators themselves, including owning/financing international fiber and submarine-cable capacity.

• CDNs and edge networks — move websites, video, software and APIs closer to users:

• Akamai

• Cloudflare

• Fastly

• Amazon CloudFront

• Google Cloud CDN Akamai, Cloudflare and Fastly have particularly extensive presence at Internet exchanges around the world.

• Data centers and interconnection — provide the physical places where networks, clouds, carriers and businesses connect:

• Equinix

• Digital Realty

• CoreSite

• CyrusOne

• QTS

• Cologix

• Iron Mountain Data Centers

• NTT Global Data Centers Equinix is especially important because its facilities provide direct interconnection among thousands of networks and cloud providers.

• Internet exchange points (IXPs) — locations where networks exchange traffic directly:

• Equinix

• DE-CIX

• AMS-IX

• LINX

• Seattle Internet Exchange

• NYIIX IXPs help keep traffic local and reduce dependence on long-distance transit.

• Submarine cable operators/owners — provide much of the intercontinental physical connectivity:

• Google

• Meta

• Microsoft

• Amazon

• SubCom

• Alcatel Submarine Networks

• Orange

• Tata Communications

• NTT

• various telecom consortia The major cloud/content companies have become substantial owners or capacity buyers on submarine systems.

• Network/security infrastructure — companies that sit between users and the underlying Internet:

• Cloudflare — DNS, CDN, DDoS protection, edge networking, security

• Cisco — routers, switches and networking equipment

• Juniper Networks — routers and network infrastructure

• Palo Alto Networks — network security

• F5 — application/network delivery

• Fortinet — network security

The companies I'd consider most strategically important

If you're looking for a short list of companies at the “core” of the modern Internet, I'd start with:

Amazon/AWS, Microsoft, Google, Cloudflare, Akamai, Equinix, Lumen, Arelion, NTT, Tata Communications, Verizon, AT&T, Deutsche Telekom, Orange, Singtel, Telstra, Digital Realty, and DE-CIX.

There is an important distinction, though: AWS, Azure and Google Cloud aren't simply “Internet backbone companies,” while AT&T/Arelion/Lumen aren't simply cloud companies. Modern Internet infrastructure increasingly overlaps these categories—hyperscalers operate private backbones, CDNs operate huge networks, and data-center companies provide the interconnection layer.

If you're asking because you're interested in investing in the companies that are effectively the “picks and shovels” of the Internet/AI infrastructure boom, I can also break this into 10–20 publicly traded companies and explain exactly what part of the Internet each one controls.

If by “core internet infrastructure” you mean the companies that operate the networks, data centers, routing, DNS, cloud, and delivery systems that the public Internet depends on, there isn't one industry—it's a stack of different infrastructure providers.

1. Global Internet backbone / IP transit

These companies operate large-scale fiber and IP networks and sell connectivity to other networks, ISPs, enterprises, and content providers.

• Arelion — formerly Telia Carrier; one of the major global Tier-1 backbone networks.
• Cogent Communications — operates a large, fiber-based Tier-1 network across multiple continents.
• Lumen Technologies — operates extensive long-haul fiber and Internet backbone infrastructure.
• NTT — operates a major global IP backbone.
• GTT Communications — provides IP transit and network services.
• Tata Communications — particularly important for international connectivity.
• Hurricane Electric — major IPv4/IPv6 backbone and peering network.

A useful indication of the backbone ecosystem is Equinix's current list of upstream providers, which includes Arelion, NTT, GTT, Lumen and Cogent among others.

2. Cloud infrastructure

These companies provide enormous amounts of the computing, storage, networking and database infrastructure on which Internet services run:

• Amazon Web Services (AWS)
• Microsoft Azure
• Google Cloud
• Oracle Cloud Infrastructure
• Alibaba Cloud

AWS, Azure and Google Cloud in particular are effectively enormous private infrastructure layers sitting on top of and interconnected with the public Internet.

3. CDN, edge, DNS and Internet security

These companies sit much closer to the end user and can effectively become part of the Internet's operational front door:

• Cloudflare — DNS, CDN, DDoS protection, security, edge compute and networking. Its CDN operates from hundreds of cities globally.
• Akamai Technologies — one of the oldest and largest distributed content-delivery networks.
• Fastly — CDN and programmable edge infrastructure.
• Amazon Web Services — CloudFront CDN and Route 53 DNS.
• Google Cloud — Cloud CDN/Media CDN and Cloud DNS.
• Microsoft Azure — Azure Front Door and Azure DNS.

The distinction between CDN, security and compute is increasingly blurry: modern edge providers combine caching, DDoS protection, WAFs, DNS, TLS termination and application execution.

4. Data centers and Internet interconnection

The Internet also depends heavily on companies that provide the physical facilities where networks meet:

• Equinix — probably the most strategically important independent Internet interconnection company.
• Digital Realty
• CyrusOne
• QTS Data Centers
• NTT Global Data Centers

Internet exchanges and carrier-neutral data centers are particularly important because they allow thousands of networks to peer directly rather than sending traffic through a single upstream provider.

5. Submarine cable infrastructure

A huge proportion of intercontinental Internet traffic travels through undersea fiber-optic cables. Important participants include:

• Google
• Meta Platforms
• Amazon
• Microsoft
• Telecom Italia Sparkle
• SubCom — builds and deploys submarine cable systems.

The hyperscalers increasingly invest directly in submarine cables because controlling international connectivity improves capacity, latency and redundancy.

The companies I'd consider most strategically important

If you're trying to identify the “infrastructure giants underneath the Internet,” I'd start with roughly this group:

One important caveat: no single company “runs the Internet.” The Internet is a federation of tens of thousands of independently operated networks that connect through BGP, peering, transit, Internet exchanges, data centers and physical fiber. That's why a company such as Cogent can operate a huge Tier-1 network while still being only one component of the overall Internet.

If you're asking this from an investment/industry perspective, I can also break the Internet infrastructure market into the 20–30 companies that are most critical and economically defensible, including who owns the fiber, data centers, DNS, CDN, submarine cables and cloud capacity.

Core internet infrastructure spans several distinct layers, from physical underwater cables and global fiber backbones to domain naming systems and cloud content delivery networks.

Here are the key companies driving the core internet infrastructure and services, broken down by category:

• Tier 1 Internet Backbone Providers: These companies own and operate the global fiber-optic networks that carry internet traffic worldwide without needing to pay any other networks for transit (settlement-free peering).
  • Arelion (formerly Telia Carrier) — Operates one of the largest global backbone networks.
  • NTT Communications — Major global IP backbone spanning Asia, the Americas, and Europe.
  • Lumen Technologies — Operates a massive enterprise fiber network inherited from CenturyLink and Level 3.
  • Cogent Communications — One of the largest Tier 1 ISPs focused on high-speed internet and VPN services.
  • Tata Communications — Manages a massive global submarine cable network and enterprise tier-1 routing.
  • Zayo Group — Provides critical bandwidth and fiber infrastructure across North America and Europe.
  • Major telecom giants like AT&T and Verizon Enterprise Solutions also operate extensive Tier 1 backbone components.
• Domain Name System (DNS) & Root Management: Companies and organizations that manage how domain names translate into IP addresses.
  • Verisign — Manages the authoritative registry for .com and .net , two of the most critical root-level namespaces on the internet.
  • Cloudflare and Google Cloud DNS — Operate massive public and authoritative DNS resolver infrastructures (such as 1.1.1.1 and 8.8.8.8).
• Content Delivery Networks (CDNs) & Edge Infrastructure: These networks cache data close to users to accelerate load times and defend against massive cyberattacks.
  • Cloudflare — Provides widespread edge security, performance, and DNS infrastructure.
  • Akamai Technologies — Pioneered the modern CDN market and still secures a vast portion of global web traffic.
  • Fastly — High-performance edge cloud platform handling heavy web and media delivery.
• Data Centers & Interconnection Facilities: The physical real estate and cross-connect fabrics where disparate networks meet to exchange data.
  • Equinix — Operates massive international carrier-neutral data centers housing core Internet Exchange Points (IXPs).
  • Digital Realty — Provides global colocation and interconnection infrastructure.
  • CoreSite — Major campus data center and carrier-dense interconnection provider in the U.S.
• Cloud Infrastructure (Hyperscalers): Companies that now host a massive percentage of core web applications, enterprise databases, and application backends.
  • Google Cloud

Would you like to explore how traffic exchange points (IXPs) work, or dive deeper into a specific category like submarine cable networks?