SITE.su is an online marketplace for premium domain names, offering a catalog of more than 39,000 to 40,000 domains, primarily in the .ru, .su, and .рф extensions. The service helps individuals and businesses find domain names for websites and online projects, with listings searchable by keyword and related terms. Customers can review available domains, use advanced search options, and download the catalog as an Excel file.

Domains are available for immediate purchase or rental. The marketplace describes purchases as online transactions with instant domain transfer, while rentals are arranged by assigning the customer’s DNS servers. Rental options may include a guaranteed right to buy the domain later. Listings display prices for both purchase and monthly rental, alongside available information such as domain age and rating.

Customers can add a domain to a purchase or rental cart and contact the marketplace to ask questions or propose a different price. Registration, sign-in, help, and online chat are also available through the site.