SITE.su is an online marketplace specializing in domain names, offering customers a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service is designed for businesses and individuals seeking memorable web addresses, including keyword-based domains, and provides tools to browse listings, search by terms or parameters, and download the domain catalog for review.

Customers can purchase a domain online or rent it by arranging their own DNS server addresses. Purchases include an immediate transfer of domain administration rights. Rental agreements are priced by calendar month and provide the renter with priority rights to buy the domain during the agreement; the purchase price is fixed in the contract. The site states that rental agreements may run for up to 50 months.

SITE.su also offers a help section, online chat, and an inquiry form for questions or price offers on individual domains. Listing information can include the purchase and monthly rental price, domain age, and search-related indicators, helping visitors compare available names before making a decision.