What this means
The IEEE assigned the MA-L block E45D51 to SFR. 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 E4:5D:51, it is SFR hardware.
Frequently Asked Questions
Who owns MAC prefix E45D51?
E45D51 is registered to SFR 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. SFR's block covers 16,777,216 addresses.
What devices use E45D51?
Any network device with a MAC address starting E4:5D:51 was manufactured by or for SFR.