SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 listings across the .ru, .su, and .рф zones. The service helps businesses and project owners find keyword-based domains, including names that match a search term, its translation, or a transliteration. Customers can browse the full catalogue, download a domain list, or use filters to search for suitable options.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights online, while rental lets customers use their own DNS servers. Rental agreements include a priority right to buy the domain during the contract period, with the purchase price fixed in the agreement; contracts can last up to 50 months. Listings show purchase and rental prices, domain age, and indicators of search popularity and SEO potential. Customers can also ask questions or propose a price through the site, with contact support and online chat available in the Help section.