What this means
The IEEE assigned the MA-M block A019B21 to El Sewedy Electrometer Egypt S.A.E.. 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 A0:19:B2:1, it is El Sewedy Electrometer Egypt S.A.E. hardware.
Frequently Asked Questions
Who owns MAC prefix A019B21?
A019B21 is registered to El Sewedy Electrometer Egypt S.A.E. in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. El Sewedy Electrometer Egypt S.A.E.'s block covers 1,048,576 addresses.
What devices use A019B21?
Any network device with a MAC address starting A0:19:B2:1 was manufactured by or for El Sewedy Electrometer Egypt S.A.E..