Point of Presence (PoP)

A Point of Presence (PoP) is a physical data center location where a CDN deploys its infrastructure. Each PoP contains edge servers, routers, switches, load balancers, and network connections that together handle traffic for a geographic region. When people say a CDN has "300 PoPs worldwide," they mean there are 300 physical locations where your content can be served from.

CDNs identify PoPs using IATA airport codes. AMS is Amsterdam, FRA is Frankfurt, NRT is Tokyo Narita, IAD is Washington Dulles, SIN is Singapore. You will see these codes in CDN response headers and dashboards. When you are debugging a cache miss or latency issue, the PoP code tells you exactly where in the world the request was handled.

Not all PoPs are the same size. Major metro PoPs in cities like London, New York, or Tokyo might have hundreds of servers handling terabits per second of traffic. Smaller regional PoPs might be a single rack at a colocation facility, serving a specific country or metro area. The big CDNs (Cloudflare, Akamai, Fastly) have PoPs on every continent, while smaller CDNs might focus on specific regions.

Many PoPs are strategically placed at or near Internet Exchange Points (IXPs), which are facilities where networks directly connect to each other. Being at an IXP means the CDN can peer directly with ISPs, reducing the number of network hops between the edge and the end user. Fewer hops means lower latency. This is why a CDN with a PoP at AMS-IX (Amsterdam Internet Exchange) can serve Dutch users faster than an origin server sitting in a data center three continents away.