It’s handy to know, so here they are:

https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts
https://mirror1.malwaredomains.com/files/justdomains
http://sysctl.org/cameleon/hosts
https://s3.amazonaws.com/lists.disconnect.me/simple_tracking.txt
https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt

To restore Pi-hole to the default blocking lists, just delete all the lists but these six five lists.

Note: There used to be a sixth list, which is now dead so you can safely delete it:

https://hosts-file.net/ad_servers.txt

Note: There used to be a seventh list, which has been discontinued, so you can safely delete it:

https://zeustracker.abuse.ch/blocklist.php?download=domainblocklist

If you visit that page in your web browser, you will simply get the message:

# ZeuS Tracker has been discontinued on Jul 8th, 2019

So, go right ahead and remove it from the lists to clean up your Pi-hole!

To delete lists, simply go to the web interface and sign in as admin, then Settings > Blocklists and use the trash icon next to the lists you want to delete and then hit “Save and Update”.

Alternatively, sign in to your Pi-hole using SSH and edit /etc/pihole/adlists.list with nano or your favourite editor, and then update the lists with pihole -g.

That’s it!