one of the options in OpenDNS is to block resolving of hosts whose IP addresses are bogons like 192.168, 10/8 and 172.16.
I would like OpenDNS to consider adding the bonjour IPs too, i.e. 169.254.
And there are other reserved blocks like 100.64.0/24 that are unrouteable across the public internet that should be on a public resolver.
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