SITE.su is an online marketplace for premium domain names, offering more than 40,000 listings in the .ru, .su, and .рф extensions. The service helps businesses and individuals find keyword-rich domains for websites, brands, and other online projects. Customers can browse a full domain catalogue, use advanced search, or explore names related to a word through transliterations, synonyms, and translations. Listings include prices and, where available, details such as domain age and search statistics.

SITE.su offers two ways to secure a domain: immediate online purchase with transfer, or monthly rental by assigning the customer’s DNS servers. Rental agreements include a guaranteed right to buy the domain, giving customers the option to acquire it later. Buyers can place an order through the site, while prospective customers may ask questions or submit a price offer; email and telephone details are required for inquiries. The marketplace also provides downloadable domain lists, including spreadsheets, and offers help and online chat through its support section.