Who owns MAC prefix 3873EA4?

3873EA4 is registered to Light Blue Optics Ltd. in the IEEE MA-M registry.

What devices use 3873EA4?

Any network device with a MAC address starting 38:73:EA:4 was manufactured by or for Light Blue Optics Ltd..

MA-M · OUI prefix

Light Blue Optics Ltd.

Any MAC address starting 38:73:EA:4 is registered to Light Blue Optics Ltd. in GB.

OUI prefix	3873EA4
Vendor	Light Blue Optics Ltd.
Registry	MA-M (28-bit, medium block)
Country	GB
Example MAC	38:73:EA:4:00:00:00

What this means

The IEEE assigned the MA-M block 3873EA4 to Light Blue Optics Ltd.. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 38:73:EA:4, it is Light Blue Optics Ltd. hardware.

Look up another MAC