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MAC prefix 00:04:3C

Assigned by the IEEE to SONOS Co., Ltd..

Prefix
00:04:3C   00-04-3C   0004.3C
Block type
MA-L (16,777,216 addresses)
Address range
00:04:3C:00:00:00 – 00:04:3C:FF:FF:FF
Organization
SONOS Co., Ltd.
Registered address
#725 Pungsan Apt. Factory, Rep. of KOREA Zip Code: 411-815, KR
Country
South Korea (KR)
Address bits
Unicast (I/G bit 0), globally unique (U/L bit 0)

Look up 00:04:3C:00:00:00

Sonos, Inc. holds 14 blocks in total: see all. Source: IEEE Registration Authority public listing.