MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix00:55:DA:80:00:00 /28
Vendor address550 S. Winchester Blvd. Suite 250 San Jose California US 95128
Country🇺🇸 United States
RegisteredOct 16, 2015
Block range00:55:DA:80:00:00– 00:55:DA:8F: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
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00:55:DA:70:00:00 /28
LUCISTECHNOLOGIES（SHANGHAI）CO.,LTD
Next
00:55:DA:90:00:00 /28
Quantum Communication Technology Co., Ltd.,Anhui
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
BroadSoft Inc holds 7 registered blocks in the IEEE registry, ranking #411 of 33,427 organizations by block count.