SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф extensions. The service helps businesses and individuals find keyword-based domain names for websites, brands, and other online projects. Customers can purchase a domain online, with administration rights transferred immediately, or rent one by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental term, with the purchase price fixed in the contract; agreements may run for up to 50 months.

The marketplace provides domain search tools, including searches by keyword and advanced parameters, and lets visitors view or download the full domain list, including spreadsheet data. Listings may show purchase and monthly rental prices, domain age, and SEO-related indicators. Customers can contact the marketplace through its help section and online chat, ask questions about a specific domain, or propose a price. SITE.su presents these services as a straightforward way to secure a suitable domain through purchase or rental.