What this means
The IEEE assigned the MA-L block 00905D to NETCOM SICHERHEITSTECHNIK GMBH. 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 00:90:5D, it is NETCOM SICHERHEITSTECHNIK GMBH hardware.
Frequently Asked Questions
Who owns MAC prefix 00905D?
00905D is registered to NETCOM SICHERHEITSTECHNIK GMBH 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. NETCOM SICHERHEITSTECHNIK GMBH's block covers 16,777,216 addresses.
What devices use 00905D?
Any network device with a MAC address starting 00:90:5D was manufactured by or for NETCOM SICHERHEITSTECHNIK GMBH.