How Netflix Streams 4K Video to 260M+ Users Globally

Inside the Open Connect CDN, microservices mesh, and encoding pipeline that powers 15% of global internet traffic.

Neo Kim✓

Staff Infrastructure Architect & Creator of SystemDesign.one

Published on Aug 07, 2026

Index of System Design Concepts in this Issue (3)

1. Open Connect CDN Appliance ArchitectureFREE 2. Adaptive Bitrate Streaming (ABR)FREE 3. Chaos Engineering & Simian Army🔒 LOCK

Concept #1 · CDN & Edge

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1. Open Connect CDN Appliance Architecture

Netflix embeds custom custom hardware Open Connect Appliances (OCAs) directly inside local ISP data centers worldwide to serve video traffic directly from within subscriber networks.

💡 Real-World Mental Model

"Placing mini vending machines stocked with the most popular movies directly inside every apartment building lobby."

⚖️ Trade-offs & Costs

Extremely high initial hardware deployment cost, but eliminates transit ISP costs and delivers sub-5ms video starts.

🎯 Why It Matters at Scale

Reduces long-haul internet backbone congestion and ensures 4K streaming even during prime-time hours.

Concept #2 · Video Delivery

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2. Adaptive Bitrate Streaming (ABR)

Chunking videos into 2-5 second fragments at multiple resolution/bitrate encodes (360p up to 4K Dolby Vision) so the client player dynamically adjusts quality based on network throughput.

💡 Real-World Mental Model

"A sports car driver automatically switching gears based on road incline and traffic speed to maintain smooth momentum."

⚖️ Trade-offs & Costs

Requires 10x-20x storage for pre-computed chunks, but guarantees video playback never stutters.

🎯 Why It Matters at Scale

Provides a buffer-free viewing experience across mobile 4G and fiber broadband alike.

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✓34 Advanced Concepts with Tradeoffs

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Written by Neo Kim

Staff Engineer sharing pragmatic software architecture patterns and visual blueprints for distributed scale.