MAC prefix 00:21:3A
Winchester Systems Inc.
| Vendor | Winchester Systems Inc. |
|---|---|
| Short name | Winchester |
| Prefix | 00:21:3A/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | 00:21:3A:00:00:00 – 00:21:3A:FF:FF:FF |
| Notations | 00:21:3A:00:00:0000-21-3A-00-00-000021.3a00.000000213A000000 |
Frequently asked questions
Which vendor does MAC address 00:21:3A belong to?
MAC addresses starting with 00:21:3A are assigned to Winchester Systems Inc. according to the IEEE registry (prefix length 24 bits).
How many addresses does block 00:21:3A contain?
The block contains 16,777,216 addresses from 00:21:3A:00:00:00 to 00:21:3A:FF:FF:FF.
Is 00:21:3A 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.