What this means
The IEEE assigned the MA-L block 001B81 to DATAQ Instruments, Inc.. 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 00:1B:81, it is DATAQ Instruments, Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 001B81?
001B81 is registered to DATAQ Instruments, Inc. 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. DATAQ Instruments, Inc.'s block covers 16,777,216 addresses.
What devices use 001B81?
Any network device with a MAC address starting 00:1B:81 was manufactured by or for DATAQ Instruments, Inc..