What IPs/URLs does GoGuardian use?

I've googled this topic, but just found GoGuardian's alt DNS provider to block websites. With the release of PiHole, you can probably guess why I'm asking this (to block GoGuardian's blocking mechanisms) but if you know, could you please tell me?
 
This approach will never be 100% effective, as too many other DNS servers will have access.
 
Upon further reflection, as long as I use 1.1.1.1 & 8.8.8.8 DNS servers, I control if & when I implement ad blocking.
 
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