SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find an internet address suited to a brand, project, or keyword, with search tools for exploring available names and related domains.

Customers can purchase a domain online, with transfer of administration rights, or rent one by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental term, with the purchase price fixed in the agreement. Rental pricing is shown per calendar month, and agreements can run for up to 50 months.

The marketplace provides domain listings with prices and selected information such as age and search-related indicators. Users can browse the full catalog, download a domain list in Excel, or use extended search options. SITE.su also offers help through its support section, including contact information and online chat, and allows customers to ask questions or propose a price for a listed domain.