SITE.SU is an online marketplace for premium domain names, offering a large selection of keyword-focused domains in the .ru, .su, and .рф extensions. The catalog contains approximately 39,000 to 40,000 domains, with listings available for immediate purchase or rental. Rental agreements include a guaranteed right to buy, giving customers a way to use a domain before deciding whether to acquire it outright.

The marketplace is designed to help individuals and businesses find a suitable name for a website or online project. Visitors can search by one or more keywords, browse related names, and use advanced search options to refine results. A complete domain list can also be viewed online or downloaded as an Excel file. Listings display purchase and rental options, and customers can add a chosen domain to the relevant cart for a direct transaction. SITE.SU also provides account registration and sign-in, along with assistance through its Help section, which includes contact information and an online chat. The service focuses on accessible domain selection and flexible acquisition options.