SITE.su is an online marketplace for buying and renting domain names, with a catalog of approximately 40,000 listings across the .ru, .su, and .рф zones. The service helps businesses and individuals find domains by name, keyword, transliteration, synonym, or other search criteria, and offers both a full catalog and downloadable listings for browsing.

Customers can purchase a domain online, with administration rights transferred immediately, or rent it by assigning their own DNS servers. Rental is priced monthly and includes a priority right to purchase the domain during the agreement, with the purchase price fixed in the contract. Rental agreements can last up to 50 months. Listings display purchase and rental prices, and may include domain age and rating information.

SITE.su also provides an extended search, an online contact and question facility, and options to discuss or propose a price for a domain. Its offering is designed to make domain selection and acquisition accessible for online projects, personal websites, and businesses seeking a suitable web address.