A severe distributed denial-of-service (DDoS) it targeting the Managed DNS infrastructure of cloud-based Internet performance management company Dyn. The list of affected websites includes Twitter, Etsy, GitHub, Soundcloud, PagerDuty, Spotify, Shopify, Airbnb, Intercom, and Heroku. DDoS attacks continue to represent a serious threat against the web services and the overall Internet infrastructure. Recent attacks powered by the Mirai botnet reached a magnitude never seen before, the attack targeting hosting provider OVH last month peaked 1 Tbps.”]
Source: http://securityaffairs.co/wordpress/52544/hacking/dyn-dns-service-ddos.html