Where can i find site's blocked by Web content filtering?

Neither Intune nor Windows (the tags you chose for this question) have any built-in web content filtering so the first question here is what product you are using to perform this filtering?

Hello

Thank you for your question and reaching out. I can understand you are having query\issues related to Web content filtering.

Please note that It is database of sites with different categories which are blocked using Web Web content filtering. You can add exception or by pass this rules.

Web content filtering policies specify which site categories are blocked on which device groups. To manage the policies, go to Settings > Endpoints > Web content filtering (under Rules).

Policies can be deployed to block any of the following parent or child categories:

Adult content
High bandwidth
Legal liability
Leisure

Reference :
https://video2.skills-academy.com/en-us/microsoft-365/security/defender-endpoint/web-content-filtering?view=o365-worldwide

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OK answer for all :

just search web site on default seach box and select url there you see all info about url