Type 24 is software loopback (127.0.0.1), it's always there and it has no MAC.
Type 6 is Ethernet-type interface (same for LAN and DUN adapters).

>Seems to work fine under NT, but could you tell me what the Type codes are? I've got an unidentified type 24 with no MAC.
>
>
>> Here is little utility I created
>>that should make it easy to retrieve the IP and MAC addresses for all installed
>>adapters. It pulls that information directly from the SNMP tree, which means
>>that it should work with every Windows version, although I have only tested
>>it on W95 and W2K Professional. I'd appreciate it if you could take a minute
>>to d/l it and let me know if it works for you.