( CNN ) -- Update : GoDaddy says hackers are not to blame for the service outage . GoDaddy , the massive Web hosting company , went down for several hours on Monday , taking an untold number of websites with it . A person affiliated with the hacking collective Anonymous -- named @ AnonymousOwn3r on Twitter -- claimed responsibility for the outage . `` I 'm taking godaddy down bacause ( sic ) well i 'd like to test how the cyber security is safe and for more reasons that i can not talk now , '' that person wrote in response to questions from a technology reporter at tech blog Mashable . The attack appeared to take down websites that use GoDaddy servers to host their information and also those that have registered their names with the company . By Monday night , however , the company , which says it is the `` largest hosting provider of secure websites in the world , '' said most of its sites were working again . `` Most customer hosted sites back online , '' GoDaddy said on Twitter . `` We 're working out the last few kinks for our site & control centers . No customer data compromised . '' The outage caused widespread Internet problems on Monday . `` The more problematic part is that any domain registered with GoDaddy that uses its nameservers and DNS records are also down , '' Mashable wrote . `` That means that even if you host your site elsewhere , using GoDaddy for DNS means it is inaccessible . '' The company , which says it hosts 53 million domain names , has not commented on the cause of the problem . `` It is not just your site , '' one apparent GoDaddy client wrote in response to the company 's tweets . `` It is EVERYTHING anyone has hosted with you ... . from e-mail to websites ... . '' GoDaddy also apologized to its customers . `` So many messages , ca n't get to you all ... Sorry to hear all your frustration , '' the company said on Twitter . `` We 're working feverishly to resolve as soon as possible . '' App publisher takes blame for massive Apple ID hack .
NEW : GoDaddy says most customer hosted sites are online . Comment: Anonymous member claims responsibility for attack . The company hosts 53 million domain names .