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MAC prefix 00:05:3C

Assigned by the IEEE to XIRCOM.

Prefix
00:05:3C   00-05-3C   0005.3C
Block type
MA-L (16,777,216 addresses)
Address range
00:05:3C:00:00:00 – 00:05:3C:FF:FF:FF
Organization
XIRCOM
Registered address
2300 CORPORATE CENTER DR., THOUSAND OAKS CA 91320, US
Country
United States (US)
Address bits
Unicast (I/G bit 0), globally unique (U/L bit 0)

Look up 00:05:3C:00:00:00

XIRCOM holds 3 blocks in total: see all. Source: IEEE Registration Authority public listing.