SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains. It offers names in the .ru, .su, and .рф zones, including keyword domains, transliterations, and names related to particular search terms or themes. Customers can purchase a domain online with immediate transfer or rent one by assigning their own DNS servers. The rental option can include a guaranteed right to buy the domain later.

The marketplace supports instant purchase and rental through online ordering, as well as inquiries and price proposals for individual domain names. Visitors can search by one or more words, use advanced search filters, browse the full catalog, or download a domain list in Excel format. Listings may include purchase and monthly rental prices, domain age, and available rating or search-statistics information. SITE.su also provides registration and login functions, along with a help section offering contact details and online chat. Its services are designed for people and businesses seeking domain names for websites, online projects, or commercial use.