Quad9 DNS Filtering
Bitstream uses Quad9 for upstream DNS resolution on all server and workstation hosts.
Quad9 routes your DNS queries through a secure network of servers around the globe. The system uses threat intelligence from more than a dozen of the industry’s leading cybersecurity companies to give a real-time perspective on what websites are safe and what sites are known to include malware or other threats. If the system detects that the site you want to reach is known to be infected, you’ll automatically be blocked from entry – keeping your data and computer safe.
Find out more about Quad9 here - https://www.quad9.net/about/