SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 listings in the .ru, .su, and .рф extensions. The platform serves businesses and individuals seeking memorable, keyword-focused domains for websites, brands, and online projects. Customers can browse domains available for immediate purchase or rent, including rental arrangements with a guaranteed right to buy. Purchases are completed online with immediate domain transfer, while rental customers can use their own DNS servers.

The marketplace offers tools to search by words, themes, and other parameters, as well as options to view or download the full domain catalog. Listings include prices for purchase and monthly rental; some also show domain age and search-related statistics. Customers who wish to negotiate or propose a different price can submit an inquiry about a specific domain. SITE.su also provides a help section with contact details and online chat, along with account registration and sign-in features. Its range includes Russian-language names, transliterations, synonyms, and translated terms across multiple business topics.