SITE.su is an online marketplace for premium domain names, offering a catalog of approximately 40,000 domains across the .ru, .su, and .рф zones. The service helps individuals and businesses find and secure domain names, including keyword-based options suited to particular topics or projects. Customers can browse the full catalog, search by words or other criteria, and download a list of available domains for review.

SITE.su offers both outright purchases and rentals. A purchase provides a transfer of domain administration rights, with online transactions described as enabling immediate transfer. Rental gives customers the right to use a domain by assigning their own DNS servers; agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract. Rental is priced by the calendar month and may run for up to 50 months. The marketplace provides domain details such as age and selected search-related indicators, along with online chat and a help section for questions, inquiries, and price proposals.