SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service is designed for individuals and businesses seeking a domain for a website, online project, or commercial presence. Customers can purchase a domain online, with administrative rights transferred immediately, or rent one by arranging to use their own DNS servers. Rental is priced by the calendar month and includes a contractual priority right to buy the domain during the rental period; the purchase price is fixed in the agreement, which can last up to 50 months.

The marketplace provides instant purchase and rental options, along with domain search tools, a full catalog, and downloadable listings in Excel. Search results include details such as price, domain age, and indicators of search popularity and SEO appeal. Customers can submit questions or offers on individual domain names, and the site provides help, contact information, and online chat.