SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered across the .ru, .su, and .рф zones. The service enables customers to buy a domain or rent it by the month, with online purchasing and transfer of administration rights described as immediate. Rental allows customers to assign their own DNS servers and includes a contractual priority right to buy the domain during the rental period, at a price fixed in the agreement. Rental contracts can last up to 50 months.

Customers can browse the full domain inventory, download a spreadsheet, or use extended search to find names by keywords and other criteria. Listings provide purchase and monthly rental prices, alongside domain age and indicators based on search statistics and search-engine data. Buyers can place an order through the site, while those interested in negotiating can submit a question or price offer. The marketplace also provides registration and login options, a help section, contact information, and online chat to support customers exploring available domains.