Can someone help me understand my firewall logs?

I noticed in my iptables logs invalid packets originating from outside my network being sent to my PC when my PC wasn’t actively running any services. I checked my router’s logs and see blocked packets from an IP with the same first three octets but the fourth is different. The router also didn’t log a few of the IPs I see on my iptables log. What exactly does this mean? They’re different IPs but all originate from the same provider. I’m guessing it’s just someone doing port scans or security scans of some sort or something but I’m wondering what possibilities there are.

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