https://community.cloudflare.com/t/archive-is-error-1001/182...
> Nameservers responsible for archive.is (ben.archive.is, anna.archive.is) are returning answers tailored to the IP address of the requestor.
And indicate that anyone who knows how to contact archive.is can ask them to resolve the issue:
> If you have a contact on the domain owner, you can ask them to fix this.
EDIT: This is knowingly blocked by archive.is. Reasoning and discussion elsewhere in post comments. No need to contact archive.is about it, they’re clearly aware.
As soon as I realized they were causing this issue I just switched away. Other DNS providers don't have this issue.
archive.is has configured their nameservers to return invalid (127.0.0.0/8, from the looks of it) responses to Cloudflare requests because they’re protesting Cloudflare’s lack of EDNS, not because EDNS is somehow required to handle the requests.
For context: EDNS sends the origin IP address of the DNS client through the resolver. Cloudflare has it disabled because of the privacy implications of sending it along.
Maybe cloudflare doesn't want to code an ad-hoc solution just to fix one site. But that doesn't matter to the customer, who just wants it to work.