What this means
The IEEE assigned the MA-L block 00103F to TOLLGRADE COMMUNICATIONS, 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 00:10:3F, it is TOLLGRADE COMMUNICATIONS, INC. hardware.
Frequently Asked Questions
Who owns MAC prefix 00103F?
00103F is registered to TOLLGRADE COMMUNICATIONS, 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. TOLLGRADE COMMUNICATIONS, INC.'s block covers 16,777,216 addresses.
What devices use 00103F?
Any network device with a MAC address starting 00:10:3F was manufactured by or for TOLLGRADE COMMUNICATIONS, INC..