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One of Z-Library's domains has been seized by the FBI
(lemmy.dbzer0.com)
The other domains are still online, though z-library has yet to respond
Post edited, thank you @mbt2402 for correcting me
In my experience it's very common for Z-Library's domains to get seized. My password manager has like 10 different domains connected to the same zlibrary account; 9 of which doesnt work anymore.
Best place you can see the currently working domain is wikipedia.
The onion link (http://zlibrary24tuxziyiyfr7zd46ytefdqbqd2axkmxm4o5374ptpc52fad.onion/) has never stopped working for me. I think it should be the most reliable way to connect to it.