SITE.su is an online marketplace specializing in premium keyword domains, with a catalog of around 40,000 domain names in the .ru, .su, and .рф zones. The service enables customers to purchase domains online or rent them by the month, offering a way to use a domain without buying it outright. According to the site, purchases include immediate transfer of domain administration rights, while rentals allow customers to set 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 agreement; contracts can run for up to 50 months.

Customers can browse the full domain list, download a spreadsheet, or use advanced search to find names by keywords, transliterations, and related terms. Listings show purchase and monthly rental prices, along with details such as domain age and search-related indicators. Interested users can submit a question or price offer, and the site provides help and online chat through its support section.