SITE.SU is an online marketplace specializing in premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service helps individuals and businesses find domain names for websites and online projects, with listings searchable by keywords and other criteria. Customers can browse the full catalog, use advanced search, or download a domain list with available performance information.

Domains are available for immediate purchase or monthly rental. Purchases are completed online, with domain administration rights transferred to the buyer. Rental allows customers to use their own DNS servers and includes a contractual priority right to buy the domain during the rental period; the purchase price is fixed in the agreement. Rental contracts can last up to 50 months. The marketplace also provides domain-specific inquiry forms, options to propose a price, and assistance through its Help section and online chat. Listings may include details such as price, domain age, and indicators related to search popularity and SEO appeal.