Two-thirds of everything the internet carries, in 2023, was video: roughly 65% of all internet traffic came from video sites, up from 51% in 2016.[7] That is the load the previous installments measured in cables, cuts, buildings, and megawatts. This one is about where those bytes actually come from — which is much closer to you than the map suggests.
A content delivery network exists because the internet was not built to serve content efficiently.[1] The origin story, in the record's own words: CDNs "arose in the late 1990s to alleviate the performance bottlenecks of the Internet as it was becoming a critical medium," providing high availability and speed "through geographical distribution relative to end users."[1] Instead of shipping every copy of every stream across an ocean, a CDN puts proxy servers near the audience and routes each request to the best one.[1]
The routing trick underneath is anycast: one IP address is shared by servers in many locations, and routers direct packets "to the location nearest the sender."[4] The same trick runs the entire domain-name system — all 13 internet root nameservers are anycast clusters.[4] The web's most fundamental lookup is answered by a fleet, not a server.
Akamai, the pioneer, runs "a network of over approximately 365,000 servers in more than 135 countries," sitting "on roughly 1,350 of the world's networks."[6] Those servers gather real-time information about traffic, congestion, and trouble spots as a side effect of serving you.[6]
The layer is also a business with actual numbers, and the numbers are weird. Cloudflare's first-quarter 2026 earnings reported a record $639.8 million in quarterly revenue, up 34% year over year — and two months later the company eliminated approximately 1,100 positions, about 20% of its workforce, in a restructuring it attributed to the rapid adoption of AI tools.[8] The edge got bigger and thinner at the same time.
Two networks carrying traffic between them settle it one of two ways. Transit: "one network pays another network for access to the Internet."[3] Peering: settlement-free exchange — "neither party pays the other in association with the exchange of traffic," known as bill-and-keep.[3] Most of the internet's traffic, especially between the largest networks, crosses private peering.[3]
The CDN sits inside this ledger in the bluntest possible way: "a CDN pays Internet service providers (ISPs), carriers, and network operators for hosting its servers in their data centers."[1] The edge is not only a geography — it is literally rented space inside the last mile. That is why the physical location of a cache matters more than the physical location of anything else on the network.
Open Connect exists for the shortest possible reason: Netflix built its own distribution network to deliver its shows and movies without paying traffic and fees.[2] It hands ISPs free appliances; since 2012 Netflix has spent over $1 billion on more than 8,000 Open Connect Appliances, and more than 1,000 ISPs have installed them, saving the ISPs $1.25 billion by 2021.[2] Netflix also owns and pays for its own boxes at more than 52 internet exchange points, where any ISP can reach them over free peering.[2]
The economics: Open Connect lets an ISP "circumvent the expenses associated with transit charge and costly international backhaul capacity" by receiving the traffic directly instead of over a transit link.[2] Netflix pre-ships copies of titles to the boxes — up to 350 TB of storage per appliance — so peak demand never has to cross the core at all.[2] The biggest source of internet traffic built its own private distribution layer rather than pay the transit market, and then made ISPs compete to host it for free.
Peering is defined as "the voluntary and free exchange of traffic between two networks, for mutual benefit" — and when the benefit is judged gone, a network may "cease peering: this is known as depeering."[3] The live map of the edge's politics is one company's rap sheet: Cogent, famous for low bandwidth pricing, fought public peering disputes with AOL (2003), Level 3 Communications (2005), France Telecom (2006), Limelight Networks (2007), Telia Carrier (March 2008), and Sprint Nextel (October 2008).[5] The recent rounds moved from theater to geography: in February 2024 Cogent withdrew peering with NTT in Europe, forcing their traffic across remaining US interconnections and raising latency; in May 2024 it withdrew peering with Tata Communications completely.[5]
Even anycast, the load-bearing reliability trick, has a failure mode worth naming: heartbeat monitoring withdraws a route when a server dies, and when the automation itself fails, the dead server becomes a black hole for nearby clients — the mechanism cited in the 2021 Facebook outage.[4]
The clearest proof that the edge layer is load-bearing came in February 2025, when the Spanish LaLiga asked telephone operators to block Cloudflare's IP address ranges to shut down pirate broadcasts of football matches.[8] The pirate platform DuckVision died; so did access to major legitimate websites caught in the same ranges, including X, Vimeo, Steam, and GitHub.[8] Blocking the CDN is not blocking the pirate — it is cutting a shared artery.
The edge has a privacy price. In 2021 a German court forbade a university website from using a CDN because serving the page transmitted the user's IP address to the CDN — a GDPR violation.[1] And because so much of the web's JavaScript is served from CDN libraries, the instruments that keep those scripts trustworthy exist: Subresource Integrity was created so a page loads only a script whose content matches a hash the author pinned.[1]
The internet's physical geography, measured in cables and buildings, is only half the map. The other half is where the copies are: the cache layer means most of what you experience does not travel the internet at all — it waits for you nearby, placed there by economics, not by geography.
The peering ledger decides more about your experience than any submarine cable: not how far the data travels, but who is willing to exchange it for free, who must be paid, and who is inside whom.
When we imagine a "counter-layer" of satellites and mesh, we picture the internet arriving from the sky. In reality, most of the bytes arrive from a rented rack in your own city — and the fastest way to deliver the internet is to never send it very far in the first place.
[1] Wikipedia: Content delivery network
[2] Wikipedia: Open Connect (Netflix)
[3] Wikipedia: Peering
[4] Wikipedia: Anycast
[5] Wikipedia: Cogent Communications
[6] Wikipedia: Akamai Technologies
[7] Wikipedia: Internet traffic
[8] Wikipedia: Cloudflare