MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix04:58:5D:50:00:00 /28
Vendor address8F, 3-1, YuanQu St., NanKang, Taipei 115, Taiwan Taipei TW 115
Country🇹🇼 Taiwan
RegisteredMay 23, 2025
Block range04:58:5D:50:00:00– 04:58:5D:5F:FF:FF
Address capacity1,048,576
AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority
TransmissionUnicast: addressed to a single device
SourceIEEE Registration Authority
Address capacity is the size of this registered block, not a count of devices actually manufactured or online. Registration identifies the organization holding the block, not a specific device model or unit.
Curious how a prefix like this turns into a full address? See how MAC addresses are structured →
Example addresses in this block
Where this block sits
Previous
04:58:5D:40:00:00 /28
Integrated Technical Vision Ltd
Next
04:58:5D:60:00:00 /28
VERTE Elektronik San. Ve Tic. A.Åž.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Sercomm Japan Corporation holds 4 registered blocks in the IEEE registry, ranking #820 of 33,421 organizations by block count.
Other blocks registered to Sercomm Japan Corporation