What this means
The IEEE assigned the MA-L block 40ECF8 to Siemens AG. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 40:EC:F8, it is Siemens AG hardware.
Frequently Asked Questions
Who owns MAC prefix 40ECF8?
40ECF8 is registered to Siemens AG in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Siemens AG's block covers 16,777,216 addresses.
What devices use 40ECF8?
Any network device with a MAC address starting 40:EC:F8 was manufactured by or for Siemens AG.