MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:1C:5B:00:00:00 /24
Vendor addressShadsworth Road Blackburn Lancashire GB BB1 2PR
Country🇬🇧 United Kingdom
RegisteredMay 13, 2007
Block range00:1C:5B:00:00:00– 00:1C:5B: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
- May 13, 2007 – Feb 9, 2008 Initial Electronic Security Systems name changedaddress changed
- Feb 9, 2008 – present Chubb Electronic Security Systems Ltd
Example addresses in this block
Where this block sits
Previous
00:1C:5A:00:00:00 /24
Advanced Relay Corporation
Next
00:1C:5C:00:00:00 /24
Integrated Medical Systems, Inc.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Chubb Electronic Security Systems Ltd holds 1 registered blocks in the IEEE registry, ranking #8,423 of 33,427 organizations by block count.