MAC prefix 1C:21:D1:C
| Vendor | Private |
|---|---|
| Prefix | 1C:21:D1:C/28 |
| Block type | MA-M (/28, 1,048,576 addresses) |
| Address range | 1C:21:D1:C0:00:00 – 1C:21:D1:CF:FF:FF |
| Notations | 1C:21:D1:C0:00:001C-21-D1-C0-00-001c21.d1c0.00001C21D1C00000 |
Frequently asked questions
Which vendor does MAC address 1C:21:D1:C belong to?
MAC addresses starting with 1C:21:D1:C are assigned to Private according to the IEEE registry (prefix length 28 bits).
How many addresses does block 1C:21:D1:C contain?
The block contains 1,048,576 addresses from 1C:21:D1:C0:00:00 to 1C:21:D1:CF:FF:FF.
Is 1C:21:D1:C a unicast or multicast address?
The least significant bit of the first byte is 0 – it is a unicast address. The U/L bit is 0, so the address is globally unique (universally administered).
How do I find the MAC address of my device?
On Linux use ip link, on Windows getmac /v or ipconfig /all, on macOS ifconfig. Note: phones and recent operating systems often use random, locally administered addresses on Wi-Fi.
Which other MAC prefixes does Private have?
Private holds 240 registered prefixes in total – the full list is on the vendor page.