MAC prefix 40:A9:CF
| Vendor | Amazon Technologies Inc. |
|---|---|
| Short name | AmazonTechno |
| Prefix | 40:A9:CF/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | 40:A9:CF:00:00:00 – 40:A9:CF:FF:FF:FF |
| Notations | 40:A9:CF:00:00:0040-A9-CF-00-00-0040a9.cf00.000040A9CF000000 |
Frequently asked questions
Which vendor does MAC address 40:A9:CF belong to?
MAC addresses starting with 40:A9:CF are assigned to Amazon Technologies Inc. according to the IEEE registry (prefix length 24 bits).
How many addresses does block 40:A9:CF contain?
The block contains 16,777,216 addresses from 40:A9:CF:00:00:00 to 40:A9:CF:FF:FF:FF.
Is 40:A9:CF 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 Amazon Technologies Inc. have?
Amazon Technologies Inc. holds 208 registered prefixes in total – the full list is on the vendor page.