Web hosting and domain registrar GoDaddy said it was working to restore services after a widespread outage affected millions of websites.
"We're working feverishly to resolve as soon as possible," the company stated to customers via its Twitter page
The disruption also impacts any website URL that is registered with GoDaddy and also uses its name servers and DNS records.
A person claiming to be an "official" member of the hacktivist group Anonymous claimed responsibility for the attack. GoDaddy has not released information about the source of the disruption.
GoDaddy has had service disruptions in the past. In 2007 some GoDaddy websites were disrupted by a distributed denial-of-service attack (DDoS).