SITE.su is an online marketplace specializing in premium domain names, offering a catalog of around 40,000 domains across the .ru, .su, and .рф extensions. Customers can purchase a domain online with immediate transfer or rent it by assigning their own DNS servers. Rental options include a guaranteed right to buy, giving businesses and project owners a way to use a domain before deciding on a purchase.

The marketplace supports browsing, advanced searches, and downloadable domain lists, with information such as prices, age, and available ratings displayed for listed names. Buyers can complete straightforward transactions through the site or contact the team to ask questions and make an offer. The catalog includes keyword domains, transliterations, synonyms, and translated terms, with listings shown in both Latin and Cyrillic scripts. SITE.su also provides help and online chat through its support section. Its services are designed for customers seeking a distinctive web address for a business, brand, or online project, whether they prefer immediate ownership or the flexibility of a rental arrangement.