SITE.su is an online marketplace for buying and renting domain names, with a catalogue of more than 40,000 names across the .ru, .su, and .рф extensions. The service helps businesses and individuals find domains for websites, projects, or online branding, including keyword-based names and related alternatives. Visitors can search by words or themes, use advanced search options, browse the full catalogue, or download domain listings in Excel format. Listings include prices and, where provided, details such as domain age and search or rating indicators.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental options may include a guaranteed right to buy the domain later. The marketplace displays purchase and monthly rental prices, and prospective customers can submit an offer or ask a question about a specific name. SITE.su also provides registration and sign-in facilities, along with help, contact information, and an online chat. Its services are designed to make comparing, selecting, and securing domain names straightforward.