I noticed that ISP Telenet.be (Belgium) for some reason routes & responds to pings on these two specific private network subnets, but only from inside Belgium on their customer network:
172.22.1.1/16 172.23.1.1/16
I've never seen a private network address ping response from the internet before so I was baffled when getting a response on every ip in those /16 subnets. What could be the reason for having specifically those two private subnets routed and responding to pings on their public network?
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