SITE.su is an online marketplace for premium domain names, offering a catalog of around 40,000 domains in the .ru, .su, and .рф zones. The service is designed for individuals and businesses seeking a domain for an online presence, with options to purchase a name outright or rent it. Purchases are handled online with immediate transfer of domain administration rights, while rental allows customers to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can run for up to 50 months.

Visitors can browse the full domain list, download listings with available metrics, or use extended search to find names by parameters or keywords. The marketplace also provides domain-specific inquiry and price negotiation options, alongside account access, help, contacts, and online chat. Listings may display purchase and monthly rental prices, domain age, and an SEO-oriented rating based on Yandex Wordstat and search-engine keyword indices.