MAC prefix A4:81:7A
| Vendor | Cig Shanghai Co Ltd |
|---|---|
| Short name | CigShanghai |
| Prefix | A4:81:7A/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | A4:81:7A:00:00:00 – A4:81:7A:FF:FF:FF |
| Notations | A4:81:7A:00:00:00A4-81-7A-00-00-00a481.7a00.0000A4817A000000 |
Frequently asked questions
Which vendor does MAC address A4:81:7A belong to?
MAC addresses starting with A4:81:7A are assigned to Cig Shanghai Co Ltd according to the IEEE registry (prefix length 24 bits).
How many addresses does block A4:81:7A contain?
The block contains 16,777,216 addresses from A4:81:7A:00:00:00 to A4:81:7A:FF:FF:FF.
Is A4:81:7A 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 Cig Shanghai Co Ltd have?
Cig Shanghai Co Ltd holds 25 registered prefixes in total – the full list is on the vendor page.