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 individuals and businesses find keyword-based domains and offers both immediate online purchases and rentals. A purchased domain is transferred through a change of administrative rights, while a rental gives the customer the ability to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months.

Customers can search domains by words or topics, use advanced search options, browse the full inventory, or download a list with available metrics. Listings may include pricing, domain age, and indicators related to search popularity and SEO potential. SITE.su also provides online checkout, account access, contact support, and a chat through its help section. For selected domains, prospective customers can submit questions or propose a price.