SITE.su is an online marketplace specializing in premium domain names, with a catalogue of more than 40,000 domains in the .ru, .su, and .рф zones. The service enables customers to purchase a domain or rent it, with options for immediate online transactions. Purchases involve transferring domain administration rights, while rental gives customers the ability to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement period, with the purchase price set in advance; agreements can last up to 50 months.

Customers can browse the full domain list, download catalogue data, or use expanded search tools to find names by keywords and related terms. Listings show purchase and monthly rental prices, and may include domain age and search-related indicators. For customers interested in negotiating, SITE.su provides a way to ask questions or submit an offer. Help resources, contact details, and online chat are available through the site. The marketplace serves businesses and individuals seeking domain names for websites, projects, or online branding.