MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix1C:78:39:00:00:00 /24
Vendor address36/F, Tencent Building, Kejizhongyi Avenue, Hi-Tech Park Shenzhen Guangdong CN 518057
Country🇨🇳 China
RegisteredSep 17, 2013
Block range1C:78:39:00:00:00– 1C:78:39: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 →
Example addresses in this block
Where this block sits
Shenzhen Tencent Computer System Co., Ltd. holds 3 registered blocks in the IEEE registry, ranking #1,295 of 33,427 organizations by block count.
Other blocks registered to Shenzhen Tencent Computer System Co., Ltd.