SITE.su is an online marketplace for premium domain names, offering a catalogue of more than 40,000 domains, including keyword-based names in the .ru, .su and .рф zones. The service enables customers to purchase a domain or rent it, with listed options available for immediate online transactions. A purchase transfers the rights to administer the domain, while a rental allows the customer to change its DNS server addresses.

Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the agreement. Rental is priced by calendar month, and agreements may run for up to 50 months. Customers can browse the full domain list, download a spreadsheet, or use advanced search to find names by specific criteria. Listings provide details such as purchase and monthly rental prices, domain age and search-related indicators. Customers can also ask a question about a domain or propose a price, with contact options and online chat available through the Help section.