I tried scanning the company A’s router connected to ISP from internal network. Quite a number of ports open. But scan from internet (external), no ports open. But scan from internal network on the company A’S range of external IP addresses and detect 1 IP address with ports open which is similar to the result of the scan of the company A’s router from internal network.
What could be the reason? There is no server attached to that particular ISP internet IP address.
