SITE.su is an online marketplace for premium domain names, offering a large catalog of keyword-based domains and websites in the .ru, .su, and .рф zones. The site describes its selection as containing around 39,000 to 40,000 domains, available for purchase or rent. Buyers can complete an online purchase with immediate domain transfer, while renters use their own DNS servers; rental listings may include a guaranteed right to buy the domain later.

The marketplace supports browsing, keyword searches, and more detailed searches by parameters. Visitors can view domain listings with prices and, where available, information such as age, rating, and search statistics. The site also offers a full domain list for viewing or download in Excel, with additional metrics noted for some listings. Purchase and rental options are presented directly alongside domains, and users can submit questions or price offers through the site. Help, contact information, and an online chat are available in the support section. SITE.su serves individuals and businesses looking for domain names for websites and online projects.