SITE.su is an online marketplace specializing in domain names, with a catalog of around 40,000 domains across the .ru, .su, and .рф zones. The service helps businesses and individuals find names for websites, online shops, blogs, and other digital projects, including keyword-based domains and names related to specific search terms.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental listings include an option with a guaranteed right to buy, giving customers a way to use a domain before deciding whether to acquire it. The marketplace supports instant checkout for both purchases and rentals, and visitors can contact the team to ask questions or propose a price.

Search tools include keyword matching, related synonyms and translations, and advanced search options. Customers can also view the full domain catalog or download a list in Excel, including available ranking and age information. Registration and account access are available through the site, while help and online chat provide additional support.