SITE.su is an online marketplace specializing in premium domain names, offering more than 40,000 domains for purchase or rental. Its listings cover the .ru, .su, and .рф domain zones and include keyword-based names, short and memorable addresses, and names related through synonyms, translations, or transliteration. Customers can browse available domains, use extended search options, view a full listing, or download domain information in an Excel file.

The marketplace supports immediate online purchases, with domains transferred to the buyer, as well as monthly rentals. Rental arrangements can include a guaranteed right to buy, giving customers a way to use a domain before deciding on a purchase. Prices and rental fees are displayed alongside individual listings, and visitors can submit a question or make an offer on a domain. SITE.su also provides registration and sign-in options, help information, and online chat for customer support. Its services are designed for individuals and businesses seeking a distinctive web address for a personal project or commercial presence.