SITE.su is an online marketplace specializing in premium domain names, with more than 39,000 listings across the .ru, .su, and .рф extensions. The service is designed for businesses, entrepreneurs, and individuals seeking a domain for a website or project. Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental listings may include a guaranteed right to buy, offering a way to use a domain before acquiring it.

The marketplace provides instant purchase and rental options, along with search tools for finding names by keyword, synonyms, translations, or other parameters. Visitors can browse or download the full domain list, which includes details such as age and ratings, and can contact the seller to ask questions or propose a price. The site also offers help, registration and login access, and an online chat. Its catalog ranges from individual domain names such as revisions.ru to related names in Russian and Latin-script spellings, giving customers multiple options to compare when choosing a suitable web address.