SITE.su is an online marketplace for premium domain names, offering buyers and businesses a broad selection of keyword-focused domains and websites. The service lists around 40,000 domains, primarily in the .ru, .su, and .рф zones, and supports both immediate purchase and rental. Customers can browse the full catalogue, use advanced search to filter listings, or download a domain list in Excel format. Each listing may include details such as price, domain age, and search or SEO-related indicators.

Purchases are completed online, with domain administration rights transferred to the buyer. For rentals, customers provide their own DNS servers; the monthly fee and rental terms are specified for each domain. Rental agreements include a priority right to purchase the domain, with the buyout price fixed in the contract. Agreements can run for up to 50 months. SITE.su also provides a help section with contact details and online chat, along with a way to ask questions or submit an offer for a specific domain.