MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:01:21:00:00:00 /24
Vendor address605 Fifth Ave. S Seattle WA US 98104-3892
Country🇺🇸 United States
RegisteredSep 8, 2000
Block range00:01:21:00:00:00– 00:01:21:FF:FF:FF
Address capacity16,777,216
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 →
Ownership timeline
- Sep 8, 2000 – Feb 12, 2004 RapidStream Inc. name changedaddress changed
- Feb 12, 2004 – present WatchGuard Technologies, Inc.
Example addresses in this block
Where this block sits
Previous
00:01:20:00:00:00 /24
OSCILLOQUARTZ S.A.
Next
00:01:22:00:00:00 /24
Trend Communications, Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
WatchGuard Technologies, Inc. holds 2 registered blocks in the IEEE registry, ranking #3,405 of 33,421 organizations by block count.
Other blocks registered to WatchGuard Technologies, Inc.