Dyn, which provides cloud-based Internet Performance Management and traffic steering to major websites, including Twitter, Zappos, Red Hat, BT, CNBC and Zillow, experienced a major DDoS was impacting its Managed DNS customers in its US East region.
On its status update site, Dyn noted that it began monitoring and mitigating a DDoS attack starting at 11:10 UTC on October 21st-Friday 2016 against its Dyn Managed DNS infrastructure.
Impacted websites and services included Etsy, Heroku, Business Insider, Soundcloud, Spotify, Reddit, Github, Twitter and others
The company reported that its services were restored to normal as of 13:20 UTC, approximately two hours after the attack began, but then new attacks emerged against the Dyn Managed DNS infrastructure.
https://www.dynstatus.com/incidents/nlr4yrr162t8