MAC prefix 38:3A:21:3
Shanghai Greatwall Safety System Co.,Ltd
| Vendor | Shanghai Greatwall Safety System Co.,Ltd |
|---|---|
| Short name | GreatwallSaf |
| Prefix | 38:3A:21:3/28 |
| Block type | MA-M (/28, 1,048,576 addresses) |
| Address range | 38:3A:21:30:00:00 – 38:3A:21:3F:FF:FF |
| Notations | 38:3A:21:30:00:0038-3A-21-30-00-00383a.2130.0000383A21300000 |
Frequently asked questions
Which vendor does MAC address 38:3A:21:3 belong to?
MAC addresses starting with 38:3A:21:3 are assigned to Shanghai Greatwall Safety System Co.,Ltd according to the IEEE registry (prefix length 28 bits).
How many addresses does block 38:3A:21:3 contain?
The block contains 1,048,576 addresses from 38:3A:21:30:00:00 to 38:3A:21:3F:FF:FF.
Is 38:3A:21:3 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.