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 individuals and businesses find an address for a website, brand, or online project, with search tools for matching terms, name beginnings, synonyms, and other criteria. Visitors can browse the full inventory, download a domain list, and review details such as prices, age, and available traffic indicators.

Customers can buy domains online, with the site describing purchase and transfer as immediate, or rent them by assigning their own DNS servers. Rental is also offered with a guaranteed right to buy, giving customers an option to secure a name before purchasing it. Listings show purchase prices and monthly rental rates, and customers can submit questions or propose a price through the site. Help, contact information, and online chat are available in the support section. SITE.SU focuses on making domain selection and acquisition accessible through a searchable catalog and straightforward online options.