Netflix does not stream from Netflix

Understand it one step at a time

The short runs these in order in about 22 seconds. Here they are written out — pick any step to jump the short straight to it.

1. 1

   It is not coming from Netflix

   When you press play, the video almost never travels from Netflix's own data centres to your TV.

   Player idle

2. 2

   Two separate planes

   Netflix splits the job in two: a control plane that decides things, and a data plane that moves bytes.

   Mapping the system

3. 3

   You press play

   Your app asks the control plane one question: where should I get this title from right now?

   Requesting manifest

4. 4

   It answers with a ranked list

   The reply is not video. It is a manifest naming the nearest servers, sorted by measured latency.

   Manifest received

5. 5

   That server is a real box

   Open Connect appliances are physical servers Netflix ships to internet providers, for free.

   Locating appliance

6. 6

   Filled while you sleep

   Every night Netflix predicts what your region will watch and pre-loads it onto that box.

   Prefill window open

7. 7

   Then the bytes go local

   Playback streams from inside your ISP, so the video never crosses the public internet at all.

   Streaming from ISP

8. 8

   Why it feels instant

   A few milliseconds away, already cached, and the quality adapts per chunk. That is the whole trick.

   Playing 4K