SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, including keyword-rich options in the .ru, .su, and .рф zones. The service helps individuals and businesses find a domain for an online project, with listings searchable by words, themes, and other parameters. Customers can review available names alongside displayed purchase and monthly rental prices, and download the full catalog, including listed domain metrics.

SITE.su offers two ways to obtain a domain. Buyers can purchase online, with the site describing the transfer of domain administration rights as immediate. Alternatively, customers can rent a domain by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the agreement. The marketplace also provides a contact form for questions or price offers, as well as help information and online chat. Its focus is domain acquisition and leasing, rather than customs services suggested by some promotional text about individual listings.