SITE.su is an online marketplace specializing in premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can purchase a domain with online processing and immediate transfer of administrative rights, or rent one by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can run for up to 50 months.

The marketplace supports domain discovery through keyword searches, advanced filters, and downloadable catalog lists, including spreadsheets with domain metrics. Listings display details such as purchase and monthly rental prices, registration age, and SEO-related ratings. Customers can submit questions or offers on individual domains, and the site provides help, contact information, and online chat. SITE.su serves businesses and individuals seeking domain names for websites, brands, or online projects, combining a broad selection with flexible acquisition options.