Hello Fidele,
I understand that you want to access 'shodan.io' and it was blocked as a hacking site. There are a couple of ways.
(a) you can override your URL filtering object and allow hacking sites.
(b) Depending on the PAN-OS, you can add one site in exception as a white list
(c) you can create a custom URL object and allow it.
(d) If you only want to allow for one user, you can create a policy based on the user, and URL
some useful documents.
https://docs.paloaltonetworks.com/pan-os/7-1/pan-os-admin/url-filtering/url-filtering-concepts/url-category-exception-lists.html
https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-admin/url-filtering/url-filtering-concepts/block-and-allow-lists
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000CltmCAC
Thanks
Himani
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