When a request for a domain is blocked by the OpenDNS service, our DNS resolvers will return the IP of our block page servers rather than the IP of the initially requested domain. These block page servers are referred to as ‘landers.' Recent infrastructure updates have required changes to the IP addresses that are provided as a response to blocked requests.
For some customers, that may mean you need to update firewall rules to allow these new IPs to be visible from the client. For other customers, you may need to update your .PAC file to work with an HTTP proxy.
The new list of IP addresses for the block page landers is here:
The updated .PAC file for HTTP proxies in case you might be using OpenDNS with an HTTP proxy is here: