SITE.su is an online marketplace for premium domain names, offering thousands of domains in the .ru, .su, and .рф extensions. The service helps businesses and project owners find relevant names through search tools that organize listings by matching terms, transliterations, translations, and synonyms. Visitors can view domain details, browse the full catalogue, download listings, and contact the marketplace with questions or an offer.

Domains are available for immediate online purchase or monthly rental. According to the site, purchases include instant domain transfer, while rental is arranged by assigning the customer’s DNS servers; some rentals also include a guaranteed right to buy. Listings display prices and may include information such as domain age, ratings, and search statistics, helping customers compare options. The catalogue features Russian- and Latin-script names across a range of topics. SITE.su also provides account access, a help section, contact options, and an online chat, making it possible to get assistance or negotiate before choosing a domain.