SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available across the .ru, .su, and .рф zones. The service helps businesses and individuals find web addresses for online projects, including keyword-based names and domains that may support branding and search visibility. Customers can browse listings, search by terms or other criteria, view domain details, and download the full catalogue as an Excel file.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights, while rental allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and can run for up to 50 months. The marketplace also provides an option to ask questions or submit an offer on a domain, alongside account access and help through its support section and online chat. Listing information may include pricing, domain age, and search-related indicators to help customers compare options.