SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains listed for customers to browse. Its inventory focuses on keyword-rich and memorable names across the .ru, .su, and .рф domain zones, including Russian-language names and transliterations. Visitors can search by words or themes, use advanced search options, view the full domain catalogue, or download a spreadsheet of listings.

The marketplace offers both immediate domain purchases and monthly rentals. Purchases are completed online with immediate domain transfer, while rental customers assign their own DNS servers. Selected rental arrangements also include a guaranteed right to buy the domain. Listings display purchase and rental prices, and some include details such as domain age, ratings, and search statistics. Customers interested in negotiating can send a question or propose a price through the site; email and telephone details are required for enquiries. SITE.su also provides a help section and online chat for assistance, along with account registration and login options.