SITE.su is an online marketplace for premium domain names, offering customers a broad selection of keyword-focused domains in the .ru, .su, and .рф zones. The site advertises more than 39,000 domains and provides tools to browse the full inventory, search by keywords or other criteria, and download a domain list in Excel format.

Customers can purchase eligible domains online, with transfer of administration rights, or rent them 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 stated maximum rental term is 50 months. Listings show information such as purchase and monthly rental prices, domain age, and search-related indicators.

SITE.su also provides a contact form for questions or price offers, along with a help section and online chat. Its marketplace is intended for businesses and individuals seeking domain names for websites, brands, or other online projects.