Can I see the IP Address or MAC Address of a machine in the query log?

Hello,

Can I see the IP Address or MAC Address of a machine in the query log?

Currently it only shows the client domain name, in this case it's UNKNOWN

Looking in the DHCP settings there are several devices listed as UNKNOWN on my network..

I am trying to identify one particular device so I can give it a static DHCP and name it. Thanks

In Tools / Network it shows the IP, mac address and vendor

If this is not sufficient to identify the client, you could try to disable the IP to name resolution:
https://docs.pi-hole.net/ftldns/configfile/#resolve_ipv4
https://docs.pi-hole.net/ftldns/configfile/#resolve_ipv6