What this means
The IEEE assigned the MA-L block 00404D to TELECOMMUNICATIONS TECHNIQUES. 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 00:40:4D, it is TELECOMMUNICATIONS TECHNIQUES hardware.
Frequently Asked Questions
Who owns MAC prefix 00404D?
00404D is registered to TELECOMMUNICATIONS TECHNIQUES 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. TELECOMMUNICATIONS TECHNIQUES's block covers 16,777,216 addresses.
What devices use 00404D?
Any network device with a MAC address starting 00:40:4D was manufactured by or for TELECOMMUNICATIONS TECHNIQUES.