SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered for businesses and digital projects. Its catalog focuses on keyword-rich names in the .ru, .su, and .рф extensions, including domains with related spellings, transliterations, synonyms, and translations. Customers can buy a domain online with immediate transfer or rent one by assigning their own DNS servers. Rental listings may include a guaranteed right to purchase, giving customers an option to secure a name before committing to a full purchase.

The marketplace provides tools to browse the complete domain list, download listings in Excel, and search using multiple words or advanced parameters. Listings show purchase and monthly rental prices, and may include domain age and search-related statistics. Customers can add a domain to a cart for immediate purchase or rental, or contact the seller to ask a question or propose a different price. SITE.su also provides registration, account access, help, and online chat for customers seeking assistance with their domain choices.