Block High Risk TLDs

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Block High Risk TLDs

L2 Linker

Hi All,


I want to start blocking 'high risk' top level domains within PAN-OS. Has anyone else done this successfully? 


I presume the following should work based on PAN-OS RegEX:


URL Category:






Set URL Category to 'Block' within existing URL Filtering Profile.






Cyber Elite
Cyber Elite


I would say utilize the dynamic features of the PAN to do this for you instead of utilizing specific lists. Enable all, AntiVirus, Anti-Spyware with DNS sinkhole, Vulnerability protection, URL filtering, and wildfire. Then use a secure DNS provider, either palo alto's or someone elses, and block all others. I made a video for a conference regarding secure DNS that is worth the 12 minutes.


Its all about defense in depth and machine learning, rather than static lists.


Hope this helps.


L0 Member

You can dig more from Unit42 post: 
Also, from

If you want to do it at larger scale, EDL can be a better choice than static entries.

L2 Linker

Thanks for the responses all. 


I still believe PAN-OS should support blocking specific TLDs in a simple way; this seems like a fool proof way to greatly reduce the attack surface since we never need to visit sites using these TLDs for legitimate reasons.

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