What this means
The IEEE assigned the MA-L block 10005A to IBM Corp. 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 10:00:5A, it is IBM Corp hardware.
Frequently Asked Questions
Who owns MAC prefix 10005A?
10005A is registered to IBM Corp 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. IBM Corp's block covers 16,777,216 addresses.
What devices use 10005A?
Any network device with a MAC address starting 10:00:5A was manufactured by or for IBM Corp.