Multiple BAD_ADDRESS in DHCP showed up again

They came back for some reason.  About eight of them.

Are those addresses all in sequence, or are they random?

Thanks Cliff.  I guess I need to find those devices.  Let me think how...

Somewhat in sequence but not really.  
.100
.105
.106
.117
.118
.120
.123
.124

If you ping those addresses, do you get a response?

Note that a lack of a response on a given address doesn't necessarily mean that address isn't in use, as there could be a device there with a firewall that blocks ICMP traffic. If you do get a response, though, the address is unquestionably in use by something.

Yes, they are all pingable.  3 of them I can even resolve a hostname with ping -a ipdaddress

I'll try thanks John!

Enable conflict detection with this PowerShell. Most of the times I see BAD_ADRESS it is because of static addresses in a range

Set-DhcpServerSetting -ConflictDetectionAttemps 2

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Delete the existing ones with this PowerShell

$DHCPBadReservations = Get-DhcpServerv4Scope -ComputerName $DHCPServer | Get-DhcpServerv4Lease -ComputerName $DHCPServer | Where-Object -FilterScript {$_.HostName -eq 'BAD_ADDRESS'}
$DHCPBadReservations | Remove-DhcpServerv4Reservation -ComputerName $DHCPServer

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Serialband, will arp show multiple systems matching MAC addresses or only the first to answer?

Thanks. I did not think that would work as I never used it for that. I learned something new today!  :-)

That much I could figure out!  :-)

@Tiras25 - Thank you and I was happy to help.