Can you tell who is connected to the company Wi-Fi?

Yes, from the access point or Wi-Fi controller: its client list shows every connected device with its MAC address, signal strength and often a device name. Compare it with what you expect, and check the router's DHCP leases for devices that took an address recently. A few settings make the list easier to trust: a separate guest network for visitors and personal phones, a Wi-Fi password that changes when staff leave, and WPA2 or WPA3 Enterprise with individual logins instead of one shared key. Modern phones use a different MAC address on each network, so an unfamiliar address is not proof of an intruder. NetSenX does not manage Wi-Fi, but its network map shows the devices that talk on monitored segments, so a newcomer reaching internal servers stands out.

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