SITE.su is an online marketplace for 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 its administration 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; rentals can last up to 50 months.

The marketplace provides tools to browse the full domain catalog, download listings, and search by keyword or other criteria. Listings include purchase and monthly rental prices, domain age, and a rating based on search and SEO-related indicators. Visitors can also ask questions about a domain or submit a price offer through the site, with contact details required. A help section and online chat are available for assistance. SITE.su presents domain names for a range of potential projects and businesses, including keyword-based options and related names in Russian and transliterated forms.