![]() Network Utility is obviously limited to the Mac, and while there are no built-in tools on the iOS side of things, it is possible to perform port scanning from an iPhone and iPad with the fing app a free tool that is very handy addition to the advanced iOS users toolkit. This makes Network Utility’s port scanner an excellent way to quickly check security and test out potential vulnerabilities or active services on neighboring Macs, iOS devices, Windows, Linux machines, and whatever other computers are getting scanned. If you see absolutely nothing come up but you know an IP is active with open services, either the machine isn’t broadcasting, the recipient machine is rejecting all requests, or perhaps a strong firewall is configured. The port scan will go quite high as it scans, so just let it run if you want to see everything. Visible ports are going to differ per machine depending on what services and servers are available, but if you’re scanning Macs and PC’s you’ll commonly find web servers, SMB Windows sharing port 445, AFP Apple File Sharing on port 548, maybe active visible SSH server on 22, UDP servers, and potentially a wide variety of others. For example, you may see something like this if you scan localhost (127.0.0.1): Let the Port Scan tool run and you will quickly start to see any open TCP ports and their traditionally identified usage.
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