SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 39,000 domains across the .ru, .su, and .рф zones. The platform enables customers to purchase a domain or rent it by the month, offering an alternative for businesses and projects that want a suitable web address without an immediate full purchase. Purchases are completed online with transfer of domain administration rights, while rental gives the customer the ability to assign their own name servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price set in the contract; agreements may run for up to 50 months.

Customers can browse the full domain list, download catalog data, or use an advanced search to find names by keyword, synonyms, translations, and other parameters. Listings provide purchase and monthly rental prices, along with available age and search-related indicators. SITE.su also offers a help section, online chat, and a contact form for questions or price proposals.