What this means
The IEEE assigned the MA-L block 381A52 to Seiko Epson Corporation. 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 38:1A:52, it is Seiko Epson Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 381A52?
381A52 is registered to Seiko Epson Corporation in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Seiko Epson Corporation's block covers 16,777,216 addresses.
What devices use 381A52?
Any network device with a MAC address starting 38:1A:52 was manufactured by or for Seiko Epson Corporation.