SITE.su is an online marketplace for premium domain names, offering a catalog of around 40,000 domains in the .ru, .su, and .рф zones. The service helps individuals and businesses find keyword-focused web addresses for projects across a range of themes. Customers can purchase a domain online with immediate transfer or rent one by assigning their own DNS servers. Rental options include a guaranteed right to buy, giving customers a path from temporary use to ownership.

The marketplace provides tools to browse the full domain catalog, search by keywords and other parameters, and download listings with available metrics. Search results may include related names, synonyms, transliterations, and translations, helping users consider alternative domain options. Listings show purchase and monthly rental prices, alongside details such as domain age and ratings where available. Customers can add a domain to a purchase or rental cart, or contact the marketplace to ask questions and propose a price.