MAC prefix 1A:90:21
Physical Security Interoperability Alliance
| Vendor | Physical Security Interoperability Alliance |
|---|---|
| Short name | PhysicalSecu |
| Prefix | 1A:90:21/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | 1A:90:21:00:00:00 – 1A:90:21:FF:FF:FF |
| Notations | 1A:90:21:00:00:001A-90-21-00-00-001a90.2100.00001A9021000000 |
Frequently asked questions
Which vendor does MAC address 1A:90:21 belong to?
MAC addresses starting with 1A:90:21 are assigned to Physical Security Interoperability Alliance according to the IEEE registry (prefix length 24 bits).
How many addresses does block 1A:90:21 contain?
The block contains 16,777,216 addresses from 1A:90:21:00:00:00 to 1A:90:21:FF:FF:FF.
Is 1A:90:21 a unicast or multicast address?
The least significant bit of the first byte is 0 – it is a unicast address. The second least significant bit is set, so the address is locally 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.