SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service helps businesses and individuals find memorable web addresses for websites, online projects, and other digital ventures. Visitors can search by one or more keywords, explore related or transliterated names, use advanced search options, and browse or download the full domain list as an Excel file.

Customers can purchase a domain online, with administration rights transferred immediately, or rent one by arranging for their own DNS servers to be assigned. Rental agreements are offered by the calendar month and include a priority right to purchase the domain during the agreement, with the buyout price fixed in the contract. Agreements may last up to 50 months. Listings show purchase and monthly rental prices, alongside available information such as domain age and search-related ratings. SITE.su also provides a way to ask questions or propose a price, with help, contact details, and online chat available through its support section.