Online4u AS is a Norwegian provider of domain, hosting, email, and broadband services, based in Sandefjord. The company helps customers register domain names across a wide range of international extensions, including .no, .com, .net, and .eu, and offers assistance with domain searches and registration.

Its hosting services include email with antivirus and spam filtering, IMAP, POP3 and Exchange support, webmail access for mobile devices, and daily backups. Online4u also provides web hosting on Microsoft and Linux platforms, with monitoring, backup, and infrastructure features such as cooling, UPS, and generators. The company advertises 99.99% uptime for its web hosting and offers server, database hosting, and colocation services. Customers can also access Windows and Linux server options and managed hosting.

For broadband, Online4u lists fiber services. The company also points customers seeking professional, tailored content management or e-commerce solutions to its partner, Enfinity AS. Support, customer and reseller logins, and webmail access are available through its website.