SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, including keyword-focused names in the .ru, .su, and .рф zones. The service helps individuals and businesses find a domain for a website, brand, or online project, with listings that can be explored through keyword searches, filters, and a complete downloadable catalogue.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental options include a guaranteed right to buy, giving customers a way to use a domain before deciding to acquire it. The marketplace provides separate purchase and rental prices, and visitors can submit questions or make an offer on a listing. Search results may also include information such as domain age and available rating or search-statistics indicators.

SITE.su supports registration and sign-in, while its Help section provides contact information and online chat. Its catalogue spans Russian-language and Latin-script names, with listings such as bliky.ru presented alongside related domain suggestions.