What this means
The IEEE assigned the MA-L block 001B3F to ProCurve Networking by HP. 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:3F, it is ProCurve Networking by HP hardware.
Frequently Asked Questions
Who owns MAC prefix 001B3F?
001B3F is registered to ProCurve Networking by HP 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. ProCurve Networking by HP's block covers 16,777,216 addresses.
What devices use 001B3F?
Any network device with a MAC address starting 00:1B:3F was manufactured by or for ProCurve Networking by HP.