GoDaddy, which hosts more than 5 million websites, said it was still investigating what may have caused many of its clients' sites to get knocked offline.
The Scottsdale, Ariz.-based Internet company told the Los Angeles Times that its IT department was working aggressively to investigate the problem as well as restore its clients' websites. It declined to say how many websites were affected.
"GoDaddy did experience some intermittent outages, and it impacted our site and some customer sites," company spokeswoman Elizabeth Driscoll said. "We're working to restore all services. Some are already back online."
Driscoll said the outages began shortly after 10 a.m. PDT, and they may have caused millions of websites to go offline.