SITE.su is an online marketplace specializing in premium domain names, including keyword-focused domains in the .ru, .su, and .рф zones. The platform offers a catalog of more than 39,000 domain names, with options to purchase or rent selected domains online. Buyers can complete purchases instantly, with administrative rights to a domain transferred to them. Rental arrangements allow customers to use a domain by assigning their own DNS servers, and include a priority right to purchase it during the rental period. The buyout price is fixed in the rental agreement, which can last up to 50 months.

Customers can browse the full domain list, download listings, or use advanced search tools to find names matching particular words or topics. Each listing may include purchase and monthly rental prices, domain age, and indicators related to search-term popularity and SEO appeal. SITE.su also provides a help section with contact details and online chat, and allows prospective customers to ask questions or submit an offer on a domain.