Simple fix for catbox blocking, from the site themselves.
(catbox.moe)https://catbox.moe/faq.phpRelevant text for those who can't get there right now...
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Why can't I see anything on files.catbox.moe?
Catbox is currently blocked by some ISPs and filtered DNS servers. If you're a subscriber of British Telecom (BT), Vodafone, or some Australian/New Zealand ISPs, and are not using custom DNS servers, you will probably have issues. Additionally, Catbox has been blocked by Quad9 before. The question is, why are you still using ISP/filtered DNS servers? Consider using OpenDNS, Quad8 (Google DNS), or Level3.
I've confirmed this myself when dulcima posted about switching `files.catbox` to `de.catbox`. They both resolve to the same IP address, as the former is simply the CNAME of the latter. Were it an IP block, that trick would not work.
I also have zero issues on Comcast because I run my own DNS server, and all their "Security Suite" was doing to block catbox was to filter the DNS entry.
tl;dr - You don't need a VPN, browser extension, etc. You just need to stop using your ISP's kiked DNS servers. There are plenty of options, including running your own. Even my stupid ass was able to get it setup.*
