SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 39,000 domains in the .ru, .su, and .рф zones. The service enables customers to search listings, compare domain details, and purchase or rent names online. Purchases provide an immediate transfer of domain administration rights, while rentals allow customers to direct the domain to 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 offers tools to browse or download the full domain list, search by multiple keywords or advanced criteria, and review information such as domain age and SEO-related ratings. Customers can also contact the seller through an online chat or inquiry form, ask questions, or propose a price. Listings show purchase prices and monthly rental fees, with a shopping-cart process for transactions. SITE.su presents its inventory as suitable for businesses and personal projects seeking a relevant, memorable web address.