SITE.SU is an online marketplace for premium domain names, offering more than 40,000 domains in the .ru, .su, and .рф zones. Customers can browse names by keyword, search using multiple terms or advanced parameters, and review listings in a full catalogue that can also be downloaded as an Excel file. The marketplace supports both outright purchases and rentals, with online purchasing and immediate domain transfer. Rental lets customers use their own DNS servers and includes a guaranteed option to buy the domain. Listings display purchase and monthly rental prices, alongside available age and rating information.

SITE.SU also provides tools to compare related domains, including names matching a search term, beginning with it, or containing transliterations and translations. For buyers who want to negotiate, the site offers a contact form to ask questions or propose a price; email and phone details are required. Help and online chat are available through the support section, while account registration and sign-in enable customers to manage their activity.