What this means
The IEEE assigned the MA-L block E41F13 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 E4:1F:13, it is IBM Corp hardware.
Frequently Asked Questions
Who owns MAC prefix E41F13?
E41F13 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 E41F13?
Any network device with a MAC address starting E4:1F:13 was manufactured by or for IBM Corp.