What this means
The IEEE assigned the MA-M block 4403770 to Musashi Seimitsu Industry Co.,Ltd. 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 44:03:77:0, it is Musashi Seimitsu Industry Co.,Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 4403770?
4403770 is registered to Musashi Seimitsu Industry Co.,Ltd 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. Musashi Seimitsu Industry Co.,Ltd's block covers 1,048,576 addresses.
What devices use 4403770?
Any network device with a MAC address starting 44:03:77:0 was manufactured by or for Musashi Seimitsu Industry Co.,Ltd.