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 extensions. The service helps businesses and individuals find memorable addresses for websites and online projects, offering searchable listings, advanced filters, and downloadable domain catalogs with statistics such as age and search-related indicators.

Customers can purchase domains online for immediate transfer or rent them by assigning their own DNS servers. Some rental arrangements include a guaranteed right to buy the domain later. Listings display purchase prices and monthly rental rates, and visitors can contact the marketplace to ask questions or propose a price. The site also provides account registration and sign-in, customer assistance, and an online chat through its Help section.

SITE.su presents domains by matching terms, translations, synonyms, and beginnings, making it easier to explore alternatives to a preferred name. Its inventory includes examples such as pulsi.ru and Russian-language names, with pricing and listing information provided to support domain selection.