Today a massive Distributed Denial of Service (DDoS) attack against a DNS service provider Dyn crippled down the internet.


DDOS Attack

DNS (Domain Name System) act as the authoritative reference for mapping domain names ( to IP addresses ( In plain words, Domain Name System is simply an Internet’s phone directory that resolves human-readable web addresses, like against


If DNS layer is attacked, it becomes impossible for your browser to resolve URLs and hence website become inaccessible.

Services affected by DDOS attack

Dyn DNS (Domain Name System) is used by many popular websites and services as their primary upstream DNS provider like,

  • Twitter
  • SoundCloud
  • NY Times
  • Github
  • Spotify
  • Heroku
  • Shopify
  • Airbnb
  • Reddit


Dyn DDOS Status


Later on company posted an update stating that it’s not clear who is behind this Distributed Denial of Service attack, but the company said its engineers are working on “mitigating” the issue.

Our engineers are continuing to investigate and mitigate several attacks aimed against the Dyn Managed DNS infrastructure.

Official statement can be found here.