SITE.su is an online marketplace for premium domain names, offering a large selection of keyword-based domains and websites in the .ru, .su, and .рф zones. The store advertises more than 39,000 domains, available for immediate purchase or rental, with prices shown in rubles. Customers can buy a domain online, with the domain transferred immediately, or rent it by assigning their own DNS servers. Some rentals include a guaranteed right to purchase the domain later.

The marketplace supports searching by one or more words, browsing domains with related terms, and using advanced search options. Visitors can view the full domain list online or download a spreadsheet, with some listings providing details such as domain age, ratings, and search statistics. For buyers who wish to negotiate or ask about a specific name, the site provides a question and offer form, alongside contact information and online chat in its help section. Registration and sign-in are available for customers completing transactions. Featured listings include рейтинги.рф and domains related to ratings, rankings, and other keywords.