They're not very explicit, but their FAQ indicates that they are buffering random data and they sometimes even turn the generators off. Which would suggest that

They're not very explicit, but their FAQ indicates that they are buffering random data and they sometimes even turn the generators off. Which would suggest that they're not repeating the same random data to multiple users Interestingly most clues about how their system work are given in the 'paranormal' section of their FAQ on https://www.random.org/faq/ https://www.random.org/faq/