SITE.su is an online marketplace specializing in premium domain names, offering a catalogue of more than 40,000 domains, primarily in the .ru, .su and .рф zones. Customers can browse available names, search by keywords or other parameters, view a full inventory, or download a domain list for review. Listings include information such as purchase and monthly rental prices, domain age, and indicators related to search interest and SEO potential.

The marketplace supports immediate online purchases, with administration rights transferred to the buyer, as well as domain rentals that allow customers to use their own DNS servers. Rental agreements include a priority right to purchase the domain at a price fixed in the contract and can run for up to 50 months. Customers can ask questions or make an offer on a specific domain through the site, and assistance is available through its Help section and online chat. SITE.su serves businesses and individuals seeking memorable web addresses for websites, brands, or other online projects, with options to buy outright or secure a domain through a rental arrangement.