SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service enables customers to search listings, review domain details, and purchase or rent names online. Purchases include an immediate transfer of domain administration rights, while rentals allow customers to assign their own DNS servers. Rental agreements include priority rights to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months.

The marketplace offers search tools for finding domains by keywords, translations, and transliterations, alongside options to browse or download the full catalog. Listings provide information such as purchase and monthly rental prices, registration age, and search-related ratings. Customers can contact the site through its help section or online chat, ask questions about a domain, and submit a purchase offer. SITE.su focuses on making domain acquisition flexible, with both immediate buying and rental options for individuals and businesses seeking an appropriate web address.