Namecheap DNS hosting is under a DDoS attack, as a result millions of websites are offline.
The company issued a statement :
We regret to let you know that we are experiencing a DDoS attack against our default DNS system v2.
If your domain name(s) is using DNS system v2, it may not be resolving properly at the moment.
Unfortunately, there is no current ETA for the issue, but we are doing our best to mitigate the attack and minimize its affect on the service. We will keep you updated on the progress.
An update was later posted :
Update @ 7:45 AM EDT | 11:45 AM GMT
The attack is still ongoing, unfortunately. We are doing our best to mitigate the attack as soon as possible. Your patience and understanding are highly appreciated