SITE.su is an online marketplace for premium domain names, offering a catalogue of more than 40,000 domains across the .ru, .su, and .рф zones. Customers can search the listings by keyword or other parameters, browse a full domain list, or download catalogue data in Excel. The marketplace supports both immediate purchase and monthly rental, with listed prices and domain information such as age and search-related indicators.

Purchasing transfers the rights to administer a domain, while renting allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the rental term, with the purchase price fixed in the agreement; contracts can run for up to 50 months. The site also offers a contact form for questions or price proposals, along with help and online chat. Its services are aimed at businesses and individuals seeking a domain for a website or online project, with options to acquire a name outright or use it through a rental agreement.