How did public ip used my pihole or my network and how can securely restrict outsiders?

Since yesterday I spotted total hosts connected (just now to be 23) I was shocked because I only have around 10ish connected devices to router.

my router reboots every night and its always using different ip everyday.
so where do and how these IP's used or still have a way to use my network ?

the last to public up accessed 67b.org using my network. and taken screenshto now showing green I believe still connected ?

Seems like you've allowed port 53 on your router, which means your Pi-hole is publically accessible, which in turn means you are running an open resolver (and that's bad).

Block incoming DNS port 53 access in your router.

I was experimenting few days back with DMZ enabled for node pihole was running on and forgot to turn off ! now this is fixed.

Never ever do this. Not even when you have installed another firewall on the target of your DMZ. Always only forward ports selectively. This is much safer and avoid such "side effects".

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