SITE.su is an online marketplace for premium domain names, offering a large selection of keyword-focused domains in the .ru, .su, and .рф zones. The service enables customers to purchase a domain or rent it, with online transactions designed for immediate processing. For purchases, domain administration rights are transferred to the buyer; rental gives customers the ability to use their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price set in the contract. Agreements can last up to 50 months.

Customers can browse the available domains, search by words or other parameters, view domain details, and download a complete listing in Excel. The site also provides contact options, online chat, and a way to ask questions or submit an offer for a specific name. Domain listings may include information such as age, rating, and search-related indicators. SITE.su positions its marketplace as a practical resource for individuals and businesses seeking domain names for websites and online projects.