According to Kentik aggregate NetFlow data, internet traffic to Facebook services virtually disappeared at 15:39 UTC on Monday, October 4, 2021 with initial indications pointing to a DNS problem.
After 5.5 hours, we began seeing traffic to Facebook begin flowing again.
For more analysis of this outage, see Doug Madory’s blog post, “Facebook’s historic outage, explained.”
How do we get this data? Kentik uses thousands of service provider networks and cloud agents, located around the world, to collect information about network events, outages, and disruptions.
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Doug Madory is the Director of Internet Analysis for Kentik where he works on Internet infrastructure analysis. The Washington Post dubbed him “The Man who can see the Internet” for his reputation in identifying significant developments in the global layout of the Internet. Doug is regularly quoted by major news outlets about developments ranging from national blackouts to BGP hijacks to the activation of submarine cables. Prior to Kentik, he was the lead analyst for Oracle’s Internet Intelligence team (formerly Dyn Research and Renesys).