SITE.su is an online marketplace for premium domain names, offering a catalog of approximately 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse, search, buy, or rent domain names, including keyword-based options suited to different topics and projects. The marketplace supports immediate online purchases, with domain administration rights transferred to the buyer, as well as domain rentals that allow customers to use their own DNS servers.

Rental agreements include a priority right to purchase the domain during the rental term, with the buyout price fixed in the contract. Agreements can last up to 50 months, and monthly rental prices are displayed alongside purchase prices. Visitors can search by words or multiple topics, use advanced search options, view the full domain catalog, or download a list in Excel format. Listings may also include domain age and SEO-related indicators, with information based on Yandex Wordstat and search-engine metrics.