OTP CO.,LTD. - MAC Prefix 20B37F4 (MA-M)

What this means

The IEEE assigned the MA-M block 20B37F4 to OTP CO.,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 20:B3:7F:4, it is OTP CO.,LTD. hardware.

Frequently Asked Questions

Who owns MAC prefix 20B37F4?

20B37F4 is registered to OTP CO.,LTD. in the IEEE MA-M registry.

What does the MA-M registry type mean?

An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. OTP CO.,LTD.'s block covers 1,048,576 addresses.

What devices use 20B37F4?

Any network device with a MAC address starting 20:B3:7F:4 was manufactured by or for OTP CO.,LTD..

OUI prefix	20B37F4
Vendor	OTP CO.,LTD.
Registry	MA-M (28-bit, medium block)
Block size	1,048,576 addresses
Country	JP
Other blocks by this vendor	1 total
Example MAC	20:B3:7F:4:00:00:00