I assumed worldcat blocks all VPNs, but some users (seemingly not of AirVPN) report success reaching it with VPNs. I searched the forums and other pages found in the links at the top of the forum and didnt find it, so whatever the result/answer is, I think it's good to have it documented.
Checked the tools in the thread to check if it's an ISP issue, it shouldn't be. The route check for https://www.worldcat.org/ shows success for pings but every single server fails to connect, either with Fail (no connect) or Fail (HTTP 301) (https://airvpn.org/routes/?q=https%3A%2F%2Fwww.worldcat.org%2F). I assume this is due to the above url automatically redirecting to https://search.worldcat.org/ ? Then again, route check for that url errors out with Fail (HTTP 302) or (no connect) (https://airvpn.org/routes/?q=https%3A%2F%2Fsearch.worldcat.org%2F).
Thanks for any help in advance!