In a statement regarding the DDoS attack on 10/21/2016, Dyn confirmed the sophisticated, highly distributed attack involved 10s of millions of IP addresses.
The company said its preliminary forensic analysis, with help of analysis from Flashpoint and Akamai, indicates that the attack originated across multiple attack vectors and internet locations. One source of the traffic for the attacks were devices infected by the Mirai botnet. Dyn observed 10s of millions of discrete IP addresses associated with the Mirai botnet that were part of the attack.
http://hub.dyn.com/static/hub.dyn.com/dyn-blog/dyn-statement-on-10-21-2016-ddos-attack.html
