National filtering systems

4 articles in the Atlas on national filtering systems - Internet Shutdowns and the Law; Internet Censorship in China. When governments order the internet off: legal…

4 articles

Part of Censorship, DPI & Network Freedom · Search this topic

A judge looking serious, and a speaking balloon on a paper, on the ballon a smartphone with a prohibited symbol

Digital Rights 4 min read

Internet Shutdowns and the Law

When governments order the internet off: legal justifications, international law, accountability, and why no VPN can restore a full shutdown.

Censorship & DPI 9 min read

Internet Censorship in China

Inside China's Great Firewall in 2026: DNS poisoning, SNI and QUIC filtering, VPN crackdowns, and what still gets through.

Censorship & DPI 11 min read updated

Internet Censorship in Iran

Inside Iran's internet controls in 2026: national shutdowns, DNS and SNI filtering, throttling, tiered access, and what still gets through.

Anime-like art of what looks like a woman's face with wide-open eyes, and a mouth covered with duct tape

Censorship & DPI 7 min read updated

What Is Internet Censorship?

Censorship is not one thing. It is DNS, ports, TLS names, packet inspection and active probing. Five layers, each answering a different question about your traffic.