SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф extensions. Customers can browse keyword-focused names and related alternatives, using an extended search or downloadable domain lists to explore the inventory. Listings include prices and may display details such as domain age and search-related ratings.

The marketplace supports both immediate online purchases and domain rentals. Buyers can complete a purchase online with instant domain transfer, while renters use their own DNS servers to direct a domain to their site. Some rental arrangements include a guaranteed right to buy the domain later. Customers can also contact the seller through an online chat or inquiry form to ask questions or propose a price.

The site presents domains individually and groups suggestions by synonyms, translations, and related terms, helping customers compare options. Its services are designed for people and businesses seeking a memorable web address, whether they want to acquire a domain outright or use one through a rental arrangement.