SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available 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 options can include a guaranteed right to buy, giving users a way to secure a name before deciding on a full purchase.

The marketplace offers instant purchase and rental, a searchable domain catalogue, and tools to browse listings by keyword, synonyms, translations, or transliterations. Customers can view prices, domain ages, and available rating and search-statistics information, as well as download a complete domain list in Excel format. For buyers who want to negotiate or propose a different price, the site provides an inquiry form; help and online chat are available through its support section. Transactions and account access are handled through the website, with listings offering clear purchase and monthly rental prices.