SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su and .рф zones. The service helps businesses and individuals find names for websites and online projects, with search tools for matching words, translations and related terms. Visitors can browse the full domain list, download a spreadsheet, or use advanced search to compare available options and listed metrics.

Customers can purchase domains online, with ownership administration transferred immediately, or rent them by assigning their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and may run for up to 50 months. The marketplace displays purchase and monthly rental prices, alongside details such as domain age and ratings where available. Buyers can place an order through the site or contact the seller to ask questions and propose a price. SITE.su also provides registration and sign-in, support information, and online chat through its help section.