SITE.su is an online marketplace for premium domain names, offering a large catalog of keyword-focused domains in the .ru, .su, and .рф zones. The site invites individuals and businesses to find a domain for an online project, with listings that include purchase and monthly rental prices, along with information such as domain age and selected search and popularity indicators.

Customers can buy eligible domains online with instant transfer, or rent a domain by assigning their own DNS servers. Some rental arrangements include a guaranteed right to buy, giving customers a route from temporary use to ownership. The marketplace provides keyword and parameter-based search, lists of related transliterations and synonyms, and options to view or download the full domain catalog in Excel. Visitors can also submit a question about a specific name or propose a price. Help, contact information, and an online chat are available through the site. SITE.su positions its service as a convenient way to compare domain options and secure a name for a website or business.