SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find web addresses by keyword, related term, translation, or transliteration, with tools for expanded searches and downloadable domain lists. Listings display purchase and monthly rental prices, alongside available age and rating information.

Customers can buy domains online, with immediate transfer, or rent them by assigning their own DNS servers. Rental options include a guaranteed right to purchase, and prospective buyers can submit questions or propose a price through the site. The marketplace provides shopping-cart actions for both purchases and rentals, plus account registration, login, help, and online chat. Its catalog includes individual names and related alternatives, allowing visitors to compare options and prices in one place. SITE.su presents domain acquisition as a flexible way to secure an online address for a business or project, with browsing, ordering, and customer inquiries handled through its website.