Twitter, Spotify and Reddit, and a huge swath of other websites were down or screwed up this morning. This was happening as hackers unleashed a large distributed denial of service (DDoS) attack on the servers of Dyn, a major DNS host. It’s probably safe to assume that the two situations are related.

Update 4:22 PM EST: Looks like this is probably going to get even worse before it gets any better. Dyn says they are being hit with a third wave of attacks. Dyn told CNBC the attack is “well planned and executed, coming from tens of millions IP addresses at same time.”

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Update 12:28 PM EST: Dyn says it is investigating yet another attack, causing the same massive outages experienced this morning. Based on emails from Gizmodo readers, this new wave of attacks seems to be affecting the West Coast of the United States and Europe. It’s so far unclear how the two attacks are related, but the outages are very similar.

In order to understand how one DDoS attack could take out so many websites, you have to understand how Domain Name Servers (DNS) work. Basically, they act as the Internet’s phone book and facilitate your request to go to a certain webpage and make sure you are taken to the right place. If the DNS provider that handles requests for Twitter is down, well, good luck getting to Twitter. Some websites are coming back for some users, but it doesn’t look like the problem is fully resolved.

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Dyn posted this update on its website: “Starting at 11:10 UTC on October 21th-Friday 2016 we began monitoring and mitigating a DDoS attack against our Dyn Managed DNS infrastructure. Some customers may experience increased DNS query latency and delayed zone propagation during this time. Updates will be posted as information becomes available.”

Here’s a list of websites that readers have told us they are having trouble accessing:

ActBlue

Basecamp

Big cartel

Box

Business Insider

CNN

Cleveland.com

Etsy

Github

Grubhub

Guardian.co.uk

HBO Now

Iheart.com (iHeartRadio)

Imgur

Intercom

Intercom.com

Okta

PayPal

People.com

Pinterest

Playstation Network

Recode

Reddit

Seamless

Spotify

Squarespace Customer Sites

Starbucks rewards/gift cards

Storify.com

The Verge

Twillo

Twitter

Urbandictionary.com (lol)

Weebly

Wired.com

Wix Customer Sites

Yammer

Yelp

Zendesk.com

Zoho CRM﻿

Credit Karma

Eventbrite

Netflix

NHL.com

Fox News

Disqus

Shopify

Soundcloud

Atom.io

Ancersty.com

ConstantContact

Indeed.com

New York Times

Weather.com

WSJ.com

time.com

xbox.com

dailynews.com

Wikia

donorschoose.org

Wufoo.com

Genonebiology.com

BBC

Elder Scrolls Online

Eve Online

PagerDuty

Kayak

youneedabudget.com

Speed Test

Freshbooks

Braintree

Blue Host

Qualtrics

SBNation

Salsify.com

Zillow.com

nimbleschedule.com

Vox.com

Livestream.com

IndieGoGo

Fortune

CNBC.com

FT.com

Survey Monkey

Paragon Game

Runescape

Here’s an internet outage map from DownDetector as of 12:46 PM EST:

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Here’s a gif that shows the internet outage at 9:00 AM EST versus 12:30 PM EST:

Your browser does not support HTML5 video tag.Click here to view original GIF

At the time of publication Dyn said that it was still dealing with the problem.

What websites are down for you? Send a tip to william.turton@gizmodo.com.

Update 9:05 AM EST: Judging by emails from readers, this problem seems to be getting worse.

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Update 9:43 AM EST: Dyn says the issue has been resolved.

Update 12:19 PM EST: Dyn says the issue is resolved, but multiple readers are messaging me to say they’re still having trouble accessing websites.

Update 12:25pm EST: It’s happening again. (see above)