SITE.su operates an online marketplace for premium domain names, offering more than 40,000 domains, mainly in the .ru, .su, and .рф extensions. The service helps businesses and individuals find keyword-based web addresses, with searchable listings and tools for browsing the full inventory, filtering results, and downloading domain data. Listings include purchase and monthly rental prices, and may show details such as domain age and search metrics.

Customers can buy a domain online with immediate transfer or rent it by assigning their own DNS servers. Some rental arrangements include a guaranteed right to purchase, giving customers a way to use a domain before deciding whether to acquire it. The marketplace also supports enquiries and price offers through its contact form, with email and phone details required, and provides online chat and assistance through its Help section.

The featured listing is montazhik.ru, alongside related Russian- and Latin-script domains connected to installation and construction terminology. SITE.su presents its catalog as a resource for securing relevant, memorable domain names for websites and projects.