SITE.SU is an online marketplace for premium domain names, offering domains for purchase or rental in the .ru, .su, and .рф zones. Its catalog contains around 39,000 keyword-based domain names, with listings covering a wide range of terms and topics. Customers can buy available domains instantly or rent them, including options that provide a guaranteed right to purchase later.

The website is designed to help users find a suitable name through keyword searches, an extended search by parameters, and access to the full domain list, which can also be downloaded in Excel format. Listings display purchase and rental prices, and customers can add a domain to the appropriate cart to proceed with a transaction. Those who want to discuss a price can submit a question about a listing. The site also provides registration and login, along with a Help section featuring contact information and online chat. SITE.SU serves individuals and businesses seeking memorable domain names for websites, brands, and online projects.