Hi, I’m trying to monitor AA equipment that only connect to the Wi-Fi network via DHCP. I know the MAC addresses of the equipment. Is there a way to create a new host using the MAC address instead of the IP?
If there is DHCP for the APs then also there should be DNS available for the device names.
Inside CMK you can only use IPv4/6 or DNS names to access the host.
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To communicate with your hosts you need at least a Layer 3 protocol.
A mac address is only on Layer 2.
So an IP address or a DNS name is mandator as mentioned by Andreas.
Try to add the DNS name to the host name field and leave the IP address filed empty.
You can verify with Host → Save and go to connection Tests.
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Thanks for the answers! Very useful!! 
My implementation is as follows: My Mikrotik is used as DHCP, then I put a new static entry in the DHCP list of hosts, with an IP address outside the DHCP range (I use phpipam to manage the IP distribution). Then I created a new DNS A record for that device (this part is not necessary because I can use the IP, but I like it).
If you know the MAC then you would also know the IP (From ARP)
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