SITE.su is an online marketplace specializing in premium domain names, with a catalogue of around 40,000 domains in the .ru, .su, and .рф zones. The service helps businesses, entrepreneurs, and personal projects find descriptive, keyword-based domain names for their online presence. Customers can browse the full catalogue, search by terms or other parameters, and explore related names, including synonyms, translations, and transliterations.

Domains are available for immediate purchase or rental. The rental option includes a guaranteed right to buy, while online purchases are described as providing immediate domain transfer. The marketplace also offers downloadable domain listings, with available information such as age and ranking indicators, to support browsing and comparison. For a listed domain, customers can submit a question or propose a price; the site also provides a help section and online chat for assistance. Through flexible purchase and rental options and a broad selection of Russian-language and internationalized domain names, SITE.su serves customers seeking a suitable web address for a business, website, or other online project.