Kentik Blog: Internet Outages
In this post, we use Kentik’s traffic statistics to dig into the ongoing internet shutdown in Iran, which began within hours of American and Israeli airstrikes on February 28. This is the second shutdown of the year for Iran and its worst in history. Despite the shutdown, a small amount of whitelisted traffic continues to flow in and out of the country. Using our unique traffic data, we visualize changes within this residual traffic in recent days as the government cracks down on Iranians sharing access to these precious holes in the digital blindfold.
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.
Afghanistan has imposed its first nationwide internet shutdown, cutting off connectivity to “prevent immorality” — a blow to digital freedoms, education, and media already under severe strain since the Taliban’s 2021 return.
In this post, we dig into the impacts from the latest submarine cable cuts in the Red Sea from loss of transit for regional providers to the increase in latency for the major public clouds.
Last month, Starlink suffered its largest outage in years, arguably its biggest since becoming a major internet provider. In addition to the millions of individual customers around the world, the outage disconnected the Community Gateways, customers of Starlink’s new transit service. In this post, we delve into the outage and its impact on these far-flung networks.
On July 14, Cloudflare’s popular public DNS service (known as 1.1.1.1) suffered an outage lasting over two hours. As rumors swirled about the cause, we were the first to push back on the theory that a BGP hijack had caused the outage. In fact, the hijack was actually a consequence. How did we know this so early when other internet watchers did not? We’ll discuss in this post.
On Monday April 28, 2025, the countries of Spain and Portugal experienced a widespread electrical blackout of historic proportions. In this post, we look into the internet outages caused by the loss of power including impacts outside of the Iberian Peninsula and to Starlink service in Spain.
In this post, Doug Madory reviews the highlights of his wide-ranging internet analysis from the past year, which included covering the state of BGP (leaks and the state of RPKI adoption), submarine cables (both cuts), major outages, and how geopolitics has shaped the internet in 2024.
In the latest collision between geopolitics and the physical internet, three major submarine cables in the Red Sea were cut last month likely as a result of attacks by Houthi militants in Yemen on passing merchant vessels. In this post, we review the situation and delve into some of the observable impacts of the subsea cable cuts.
In this post, Doug Madory reviews the highlights of his wide-ranging internet analysis from the past year, which included covering the state of BGP (both routing leaks and progress in RPKI), submarine cables (both cuts and another historic activation), major outages, and how geopolitics has shaped the internet in 2023.
Last week a major internet outage took out one of Australia’s biggest telecoms. In a statement out yesterday, Optus blames the hours-long outage, which left millions of Aussies without telephone and internet, on a route leak from a sibling company. In this post, we discuss the outage and how it compares to the historic outage suffered by Canadian telecom Rogers in July 2022.
In the early hours of Wednesday, January 25, Azure, Microsoft’s public cloud, suffered a major outage that disrupted their cloud-based services and popular applications such as Sharepoint, Teams, and Office 365. In this post, we’ll highlight some of what we saw using Kentik’s unique capabilities, including some surprising aftereffects of the outage that continue to this day.
This past year was another busy one for the internet. This year-end blog post highlights some of the top pieces of analysis that we published in the past 12 months. This analysis employs Kentik’s data, technology, and expertise to inform the industry and the public about issues involving the technical underpinnings of the global internet and how global events can impact connectivity.
The populations in Cuba and Iran were only the latest to experience what has become an increasingly common tactic of digital authoritarianism: the internet curfew. This tactic, in which internet service is temporarily disabled on a recurring basis, lowers the costs and thus increases the likelihood of government-directed internet disruptions.
On July 8, 2022, Canadian telecommunications giant Rogers Communications suffered a catastrophic outage taking down nearly all services for its 11 million customers in the largest internet outage in Canadian history. We dig into the outage and debunk the notion that it was caused by the withdrawal of BGP routes.
On Tuesday, June 7, internet users in numerous countries from East Africa to the Middle East to South Asia experienced an hours-long degradation in service due to an outage at one of the internet’s most critical chokepoints: Egypt. In this blog post, we review some of the impacts as well as compare how this disruption affected connectivity within the three major public cloud providers.
Every year the internet suffers numerous disruptions and outages, and 2021 was no exception. Kentik’s Doug Madory recaps the top 10. And now the world’s network engineers deserve a load of #HugOps in 2021.