SITE.su is an online marketplace specializing in premium domain names, offering more than 40,000 domains across the .ru, .su and .рф zones. The service helps businesses and individuals find memorable, keyword-focused names for websites and online projects. Customers can browse the full catalogue, search by words or other parameters, review domain details, and download listings for comparison.

SITE.su offers both online purchases and domain rentals. A purchase transfers the rights to administer the domain, with the site describing the process as an immediate online transfer. Rental allows customers to use a domain by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the contract, with the purchase price fixed in the agreement; contracts may run for up to 50 months. Listings show prices and may include information such as domain age and search-related indicators. Customers can submit questions or price offers, and the site provides a help section with contact details and online chat.