Iran is in the midst of one of the world’s most severe communications blackouts. This post uses Kentik data to detail how this historic event unfolded, where this event lies in the context of previous Iranian shutdowns, and finally discusses what might be in store next for Iran.

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Iran is experiencing one of history's most severe internet shutdowns, affecting 90 million people for nearly two weeks. The shutdown evolved from withdrawing IPv6 BGP routes to blocking traffic while maintaining IPv4 routing visibility, enabling selective whitelisting of approved users. Analysis using NetFlow data reveals sophisticated filtering techniques including the National Information Network and traffic blocking without BGP manipulation. The government's approach reduces shutdown costs while maintaining control, with Starlink providing limited circumvention despite jamming efforts. This represents an evolution in authoritarian internet control tactics that other governments may replicate.

From Stealth Blackout to Whitelisting: Inside the Iranian Shutdown