SITE.su is an online marketplace for buying and renting domain names, with a catalog of more than 40,000 names in the .ru, .su, and .рф extensions. The service helps businesses and individuals find web addresses, including keyword-based domains, transliterations, and related terms. Visitors can search by one or more words, use advanced search options, view the full catalog, or download a domain list with available metrics.

Domains can be purchased online, with administration rights transferred immediately, or rented by the month through a change to the customer’s DNS server settings. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. Listings may show purchase and monthly rental prices, domain age, and an SEO-oriented rating based on search data. Customers can submit questions or offers on individual domains, and the site provides assistance and online chat through its Help section.