SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains across the .ru, .su, and .рф extensions. The service enables customers to purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental agreements include a guaranteed right to buy, and prospective buyers can submit questions or make an offer through the site.

The marketplace offers tools to browse the full catalog, search by keywords and other parameters, and download domain listings as an Excel file. Listings include purchase and monthly rental prices, along with available details such as domain age and ratings. Customers can use an online cart for immediate purchase or rental, and the site provides registration, account access, help, contact information, and online chat.

SITE.su presents domains related to a wide range of terms, including microbiology and technology, and groups suggestions by spelling, transliteration, and related words. Its services are aimed at businesses and individuals seeking a distinctive web address for an online project.