Some years ago, I tried OpenDNS resolvers at 208.67.222.222 and 208.67.220.220. The performance is OK and the two resolvers are on different network to avoid a single point of failure. The good news today is OpenDNS can now provide IPv6 resolvers at 2620:0:ccc::2 and 2620:0:ccd::2 for the Internet community. Looking at the address syntax, the two resolvers are on different /48 subnet and again giving some resilience.
I definitely have the need to use IPv6 resolvers for network configurations, testing and troubleshooting. A big hand to OpenDNS.
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More here:
http://www.getipv6.info/index.php/DNS_and_Naming_Issues#Recursive_DNS_servers_that_support_IPv6
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