SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse listings, search by keyword or other parameters, review domain details, and download a complete catalogue. The marketplace provides both outright purchases and monthly rentals, with prices and available information such as registration age and search-related indicators displayed for listed domains.

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 term, with the purchase price fixed in the contract. Rental terms can last up to 50 months. The site also lets visitors ask questions or submit an offer on a domain, and provides help and online chat through its support section. Its catalogue includes keyword domains and transliterated variants, with the featured tupitsa.ru listing shown alongside related names. SITE.su serves businesses and individuals seeking domain names for websites, projects, or online brands.