Massive data breach.

[fastmask]

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This will show the sites and more detail like: Name, IP, Password etc.
https://weleakinfo.com/

I've used this site before it's good but if you don't want to pay the one I linked above is great.

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It doesn't disclose what sites the emails were compromised on?

it will tell you what breach the data came from like NGU or linkden etc. the 773million one is a combination of multiple leaks