1. Cedexis. https://www.cedexis.com/
2. Cedexis Blog: DDoS attack. https://www.cedexis.com/blog/ddos-attack-details/
3. Cisco umbrella list of top 1M domains. http://s3-us-west-1.amazonaws.com/umbrella-static/index.html
4. Conviva. https://www.conviva.com/
5. Dyn DNS Traffic Steering. http://dyn.com