SITE.su is an online marketplace for premium domain names, offering a large selection of keyword-based domains in the .ru, .su, and .рф zones. The service helps businesses, entrepreneurs, and web projects find memorable addresses for their online presence, with listings that can be explored through keyword searches, advanced filters, or a downloadable catalogue.

Customers can purchase domains online, with administration rights transferred upon completion, or rent them by assigning their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and can last up to 50 months. Listings display purchase and monthly rental prices, alongside details such as domain age and search-related indicators.

SITE.su also provides a way to ask questions about a specific domain or submit an offer, as well as help resources and online chat through its support section. Its catalogue spans many themes and includes related names, synonyms, and translated terms, giving customers several options when choosing a domain.