SITE.su is an online marketplace for premium domain names, offering more than 40,000 options across the .ru, .su, and .рф extensions. Its catalog includes keyword-based domains, Russian-language names, and alternatives related by synonym, translation, or transliteration. Customers can browse listings, search by words or other parameters, view a complete domain list, or download catalog data.

The marketplace supports both direct purchases and monthly rentals. Purchases are completed online with immediate transfer of domain administration rights. For rentals, customers assign their own DNS servers; rental agreements include a priority right to buy the domain during the agreement period, with the purchase price fixed in the contract. Rental terms can extend up to 50 months. Buyers can also contact the seller to ask questions or propose a price, and assistance is available through the Help section and online chat. Listings display purchase and rental prices, domain age, and search-related indicators, helping customers compare names for potential online projects and business use.