SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find memorable, keyword-focused web addresses for websites, brands, and other online projects. Customers can browse the full domain inventory, search by words or themes, use advanced search filters, and download a complete domain list in Excel format.

Domains are available for immediate purchase or monthly rental. A purchase transfers the rights to administer the domain, while rental lets customers use the domain by assigning their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and can last up to 50 months. The site provides online checkout, account access, and a help section with contact details and online chat. Customers may also ask questions about a specific domain or submit a price offer. Listings include information such as purchase and rental prices, domain age, and indicators of search-related potential.