SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains, particularly in the .ru, .su, and .рф zones. The platform enables customers to purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental options include a guaranteed right to buy, giving users a way to secure a name before committing to ownership.

Visitors can browse the full domain list, download catalog data, or use advanced search to find names by keywords and other criteria. Listings show purchase and monthly rental prices, and may include domain age, ratings, and search-related statistics. The selection includes keyword domains, related names, and alternatives in both Latin and Cyrillic scripts. Customers can complete instant purchases or rentals through the site, while those who wish to negotiate can submit a question or price offer for a specific domain. SITE.su also provides a help section with contact details and online chat, as well as account access for registered users.