Lexmark owns both the 000200 and the 000400 ranges. This means that if you see a MAC address starting with 002000 or 000400, you are looking at a Lexmark device. Note: Both numbers are based on the canonical form of the MAC address. The fact that one OID begins with 000400 does NOT indicate that the MSB form is being used.
The last three bytes identify one unique network node within the manufacturer range. For example:
with an Ethernet MAC address of 0020004a6d5e,
the OID of 002000 represents Lexmark, and the 4a6d5e represents one unique adapter over the 002000 OID range.