SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф extensions. The service enables customers to purchase a domain online with immediate transfer or rent one by assigning their own DNS servers. Rental plans include a guaranteed right to buy, giving businesses and website owners a way to use a domain before committing to ownership.

The marketplace features keyword-based domain names, along with options grouped by matching terms, prefixes, transliterations, synonyms, and translations. Visitors can search using one or more words, filter results through advanced search, browse the complete inventory, or download domain lists in Excel format. Listings show purchase and monthly rental prices, and some include age and search-related indicators. Customers can buy or rent directly through the site, ask questions about a domain, or submit a price offer. Help, contact information, and online chat are available through the support section.