5 min read
2026-03-09
During a network audit, an administrator collects MAC addresses of all devices. OUI lookup quickly identifies the manufacturer of each device without physical access.
| Situation | Action |
|---|---|
| Unknown device on the network | Identify the manufacturer by MAC |
| Suspicious traffic | Find the source by MAC in the ARP table |
| Unauthorized access point | Identify equipment by OUI |
When configuring VLANs, port security, and ACLs on switches, you need to know device MAC addresses. Manufacturer lookup helps ensure policies are applied to the correct devices.
Identifying which devices are connected to Wi-Fi
Identifying IoT devices (cameras, smart plugs) by manufacturer
Blocking unwanted devices by MAC address
Remember that MAC addresses can be spoofed, so for critical security tasks use additional authentication methods (802.1X, certificates).
Check a MAC address with the MAC Address Lookup tool.
See also: IP Calculator, User-Agent Parser