SITE.su is an online marketplace specializing in premium domain names, with a catalog of around 40,000 options across the .ru, .su, and .рф domains. The store helps businesses, investors, and entrepreneurs find keyword-rich names, including domains that match search terms, synonyms, or transliterations. Customers can browse listings, use an extended search, view domain details, and download the full catalog for review.

Domains are available for immediate purchase or rental. A purchase transfers the rights to administer the domain, while rental allows the customer to assign their own name servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and can run for up to 50 months. The site presents purchase prices, monthly rental rates, domain age, and indicators of search and SEO appeal to support comparison.

Customers can place an order online, ask questions, negotiate a price, or contact the store through its help section and online chat.