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MAC prefix 11:11:11

Assigned by the IEEE to Private.

Prefix
11:11:11   11-11-11   1111.11
Block type
MA-L (16,777,216 addresses)
Address range
11:11:11:00:00:00 – 11:11:11:FF:FF:FF
Organization
Private
Address bits
Multicast (I/G bit 1), globally unique (U/L bit 0)

Look up 11:11:11:00:00:00

Private holds 88 blocks in total: see all. Source: IEEE Registration Authority public listing.