SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find a suitable web address through keyword-based browsing and an advanced search that filters listings by relevant parameters. Customers can review domain details, including price, age, and indicators of search interest and SEO potential, and can view or download the full catalog.

Domains are available for immediate online 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, for a term of up to 50 months. The marketplace also supports questions and price offers through its contact form, with assistance and online chat available in the Help section. SITE.su presents domain acquisition and rental as flexible options for establishing an online presence, with listings such as istyna.ru and other keyword-focused names.