SITE.su is an online marketplace for premium domain names, offering buyers a broad selection of keyword-focused domains in the .ru, .su, and .рф extensions. The site lists tens of thousands of domains and provides tools to search by keyword or other parameters, view available names, and download the full catalogue as an Excel file.

Customers can purchase a domain online, with administration rights transferred immediately, or rent it by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract. The site states that rental agreements can last up to 50 months.

Listings display purchase and monthly rental prices, along with details such as domain age and a rating based on search-related indicators. Visitors can submit questions or make an offer on a specific domain, and the marketplace provides contact details and online chat through its Help section. SITE.su serves individuals and businesses seeking domain names for websites, online projects, or brand development.