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  • Just a guess... Welcome to IPV6?  

    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-28-83-A9-76-7C-8A-E1-85-EA-B7

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  • This is in the IPv4 Scope not IPv6. The IPv6 entries would be under the IPv6 DHCP scope. 

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  • 1. They don't have long mac address they have long clients IDs. Whilst you think that column is mac address it is actually clientID which does not have to be mac address. IT typically is just the mac address but in recent years more systems are defaulting to an extended client ID - linux often does this so my first guess would be linux clients. Do you use pxe boot? windows often uses the GUID for client id in dhcp when pxe booting.

    2. Quickest way to determine what these are will be to track one down. If you have managed switches then use that to determine the port on of these mac addreses is connected to - then you know what it is. 

    What is the environment that this dhcp scope provides for? just internal workstations (i..e under your control for example all windows), or do you have guest/random devices, wifi etc? this makes a grate deal of difference to what will be accessing the dhcp. If you are seeing a large amount of unique leases that do not return these could be vms in a test environment or pxe boot etc - one off tasks.

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