1C:21:D1:F Private
Every MAC address from 1C:21:D1:F0:00:00 to 1C:21:D1:FF:FF:FF belongs to a block the IEEE assigned to Private. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 1C:21:D1:F belongs to
Written 1C:21:D1:F, 1C-21-D1-F or 1C21D1F, depending on the system. Look up a full address.
Prefix
1C:21:D1:F/28
Organization
Private
Registry
MA-M (28 bits)
Addresses
1,048,576
First address
1C:21:D1:F0:00:00
Last address
1C:21:D1:FF:FF:FF
Address type
Globally unique, unicast
Parent block
Inside 1C:21:D1
This MA-M block is carved from the 24-bit block 1C:21:D1, which the IEEE holds as IEEE Registration Authority and divides among smaller assignees.