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pfBlocker relies on Team Cymru IP to ASN Lookup v1.0 to get the list of prefixes for the defined ASN. But it seems that it is not working anymore.
https://asn.cymru.com/

Steps to reproduce:
1.) Navigate to Firewall/pfBlockerNG/IP/IPv4 
2.) Define *IPv4 Source Definitions* choosing *ASN* format and define Facebook ASN (AS32934). (It can hang and make trouble defining ASN. See https://redmine.pfsense.org/issues/12822 for more details. 
3.) On the same page, under the *Settings* section, choose *Alias Native* in the *Action* drop-down list.
4.) Save the settings on the bottom of the page.
5.) Go to Firewall/pfBlockerNG/Update and run the update. 
6.) At this stage, the firewall will have a new Alias from the Source Definition made in step 2.) but if you check it under Diagnostics/Tables, you'll notice that it's empty.