SITE.su is an online marketplace specializing in premium domain names, with a catalog of around 39,000 to 40,000 domains, primarily in the .ru, .su, and .рф zones. The service enables customers to purchase a domain or rent it with an option to buy later. Purchases are handled online, with domain administration rights transferred to the buyer; rental gives the customer the ability to assign their own DNS servers. Rental agreements include a priority right to purchase the domain at a price fixed in the contract, and may last up to 50 months.

Customers can browse the full domain catalog, download a list for review, or use advanced search to find names by keyword and other parameters. Listings show purchase and monthly rental prices, and may include domain age and search-related indicators. The site also provides a contact form for questions or price offers, along with help and online chat. SITE.su presents a range of domain names relevant to different topics and business uses, allowing visitors to compare available options and choose between immediate purchase and rental.