SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains advertised for sale across the .ru, .su, and .рф zones. The service helps businesses, website owners, and personal projects find domain names suited to their themes or keywords. Visitors can search listings by one or more terms, use advanced search options, browse or download the full domain catalogue, and review available details such as price, age, and SEO-related indicators.

Customers can purchase a domain online, with transfer of administrative rights, or rent one by arranging for their own DNS servers to be assigned. Rental is priced per calendar month and includes a contractual priority right to buy the domain during the rental period, with the purchase price fixed in the agreement. Contracts may run for up to 50 months. SITE.su also invites buyers to ask questions or propose a price, and provides help, contacts, and online chat through its support section.