[mtgx]

It's like Herman Cain's tax plan, but one 9 better.

Joking aside, shouldn't they have an alternative DNS server, too, like Google does with 8.8.4.4? Maybe 9.9.7.7 or 9.9.3.3?

[quad9_dre]

We do have another IP tied to the anycast cloud on a different /8.

149.112.112.112 - blocking, no edns (same setup/config as 9.9.9.9)

I will see about adding this to the list of things to add to documentation. (thanks for the feedback guys!)

[dharris]

Following Google's pattern, the secondary server should be 9.9.(4.5).(4.5)

[gruez]

if it's anycast, it shouldn't matter. if the first IP is down, chances are the second one would be down as well, unless they announce the IPs seperately or something.