SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, according to its website. Its listings include keyword-based domain names in the .ru, .su, and .рф zones, available for purchase or rent. The service is designed for businesses and project owners seeking a domain for an online presence, with listings that can be browsed through search and filtering tools or reviewed in a downloadable spreadsheet.

Customers can purchase a domain online, with the marketplace describing the transfer as immediate. Rental is also available: the customer assigns their DNS servers to the domain, and the agreement provides priority rights to buy it during the rental term. The purchase price is fixed in that agreement, which can run for up to 50 months; monthly rental prices are shown for individual listings. SITE.su also offers an online contact form and chat through its help section, allowing prospective buyers and renters to ask questions or propose a price.