TechCrunch: “Several waves of major cyberattacks against an internet directory service knocked dozens of popular websites offline today, with outages continuing into the afternoon. Twitter, SoundCloud, Spotify, Shopify, and other websites have been inaccessible to many users throughout the day. The outages are the result of several distributed denial of service (DDoS) attacks on the DNS provider Dyn, the company confirmed. The outages were first reported on Hacker News.” Sites impacted included Twitter, Reddit, Spotify.

• For primary source reference, see Update Regarding DDoS Event Against Dyn Managed DNS on October 21, 2016: “On Friday October 21, 2016 at approximately 11:10 UTC, Dyn came under attack by a large Distributed Denial of Service (DDoS) attack against our Managed DNS infrastructure in the US-East region. Customers affected may have seen regional resolution failures in US-East and intermittent spikes in latency globally. Dyn’s engineers were able to successfully mitigate the attack at approximately 13:20 UTC, and shortly after, the attack subsided. At roughly 15:50 UTC a second DDoS attack began against the Managed DNS platform. This attack was distributed in a more global fashion. Affected customers may have seen intermittent resolution issues as well as increased global latency. At approximately 17:00 UTC, our engineers were again able to mitigate the attack and service was restored.”
• Popular Mechanics – Hackers Wrecked the Internet Today Using DVRs and Webcams Smart home gadgets—not computers—likely did the bulk of the nefarious work today.
• New York Times – Hackers Used New Weapons in Attack on U.S. Internet