5 min read
2026-02-25
Set up a whitelist of MAC addresses for Wi-Fi. It does not replace a password but adds an extra layer of protection.
Periodically check the connected device list on your router. Unknown MAC addresses can be identified by looking up the manufacturer.
Modern smartphones (iOS, Android) use random MAC addresses for Wi-Fi. The real MAC is only visible after connecting to a trusted network.
Create static MAC-to-IP bindings for servers and printers. This ensures devices always receive the same IP address.
The arp -a command shows IP-to-MAC mappings on the local network. Duplicate MAC addresses may indicate ARP spoofing.
A MAC address does not pass through a router — it is only visible on the local network
A MAC address can be spoofed programmatically
Randomization on mobile devices hides the real address
Identify a device by MAC with the MAC Address Lookup tool.
See also: IP Calculator, Subnet Calculator