SITE.su operates an online marketplace for premium domain names, offering more than 40,000 listings across the .ru, .su, and .рф extensions. The service helps businesses and individuals find keyword-based domains, along with related names, synonyms, and transliterations. Customers can browse the full catalogue, search by terms or other parameters, and review listing details such as price, age, and available audience or search metrics.

Domains can be purchased online for immediate transfer or rented through a monthly arrangement. The marketplace also offers rental agreements with a guaranteed option to buy, giving customers a way to use a domain before committing to ownership. Listings display purchase and rental prices, and prospective buyers or renters can contact the team to ask questions or propose a price. SITE.su provides online chat and assistance through its Help section, as well as downloadable domain lists for further review. Its catalogue includes names in both Latin and Cyrillic scripts, serving a range of naming needs for websites and online projects.