SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find names for websites, brands, and personal projects, with listings that include keyword domains and related alternatives such as transliterations, translations, and synonyms.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental agreements include a guaranteed right to buy the domain, giving users a way to start using a name before committing to ownership. The marketplace supports instant purchasing and rental through its listings, and visitors can search by one or several terms, use advanced filters, or download the full domain catalogue in Excel format. Listings provide details such as prices, domain age, ratings, and selected search statistics. SITE.su also offers a help section with contact information and online chat, and users can ask questions about a domain or submit a price offer.