MAC prefix B4:21:1D
Beijing GuangXin Technology Co., Ltd
| Vendor | Beijing GuangXin Technology Co., Ltd |
|---|---|
| Short name | GuangXinTech |
| Prefix | B4:21:1D/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | B4:21:1D:00:00:00 – B4:21:1D:FF:FF:FF |
| Notations | B4:21:1D:00:00:00B4-21-1D-00-00-00b421.1d00.0000B4211D000000 |
Frequently asked questions
Which vendor does MAC address B4:21:1D belong to?
MAC addresses starting with B4:21:1D are assigned to Beijing GuangXin Technology Co., Ltd according to the IEEE registry (prefix length 24 bits).
How many addresses does block B4:21:1D contain?
The block contains 16,777,216 addresses from B4:21:1D:00:00:00 to B4:21:1D:FF:FF:FF.
Is B4:21:1D 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.