SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available for purchase or rental. Its listings focus on keyword-rich names in the .ru, .su and .рф domain zones, and the site provides tools to browse, search and compare options. Customers can search by words or themes, use advanced search filters, view the full domain list, or download listings in Excel format.

The marketplace offers two ways to use a domain. Buyers can complete an online purchase, with domain administration rights transferred instantly. Renters can use a domain by assigning their own DNS servers; rental is priced monthly and includes a contractual priority right to buy the domain during the rental term, at a price fixed in the agreement. Rental contracts can last up to 50 months.

Listings display prices and may include details such as domain age and a rating based on search-related indicators.