[devrandoom]

Are they all public? Where can I see them?

[jedberg]

You can brute force them. They don't have passwords. The point is the only "security" is knowing the short URL.

[Alifatisk]

I don't think so, but you can find the indexed urls here https://www.google.com/search?q=site%3A"goo.gl" it's about 9,6 million links. And those are what got indexed, it should be way more out there

[sltkr]

I'm surprised Google indexes these short links. I expected them to resolve them to their canonical URL and index that instead, which is what they usually do when multiple URLs point to the same resource.

[chneu]

archiveteam has the list at over 2billion urls with over a billion left to archive.