SITE.su is an online marketplace specializing in premium domain names, with a catalogue of more than 40,000 domains, primarily in 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 listings, search by words or other parameters, view domain details, or download the full catalogue with available metrics in Excel format.

Domains are offered for immediate purchase or monthly rental. A purchase transfers administration rights to the buyer, while rental lets the customer assign their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement and a buyout price fixed in the contract; the maximum rental term is 50 months. Listings display purchase and rental prices, alongside information such as domain age and search-related ratings. Customers can also ask questions or propose a price through the site, with assistance available in its Help section and online chat.