SITE.SU is an online marketplace for premium domain names, offering more than 40,000 domains, including keyword-focused names and websites in the .ru, .su, and .рф zones. Customers can browse listings, search by words or other parameters, view a full domain catalogue, or download a spreadsheet of available names. The marketplace supports immediate online purchases, with domain transfer upon purchase, as well as monthly rentals that allow customers to use their own DNS servers. Selected rental agreements include a guaranteed right to buy the domain later.

Listings show purchase and rental prices, and may include details such as domain age and search-related statistics. Customers can place an order through the site, ask questions about a specific domain, or propose a price; the Help section provides contact information and online chat. The catalogue features names across different topics, including Russian-language domains and transliterations. SITE.SU presents its service as a practical way for businesses and personal projects to find and secure a suitable web address, with tools to compare options and complete transactions online.