find MAC address

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Starpaly wrote:

I have severlal computers a printer and 2 servers with 3 switches on my network.

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...and a router probably?

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Starpaly wrote:

Using Advanced IP Scanner, I can identify most of these but several are not identifiable using this app. But all items listed have associated MAC addresses.

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If you have newer iOS, iPadOS, or Android devices on your network - these can use random MAC addresses (LAA), so show up on the network under a different MAC address. If using the hardware mAC address it's a UAA.

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Starpaly wrote:

...by the count of all devices on the network, every device has a MAC address. somewhere in the list of MAC adresses is the MAC address of the GS605 switch.

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Even if you try hard - unmanaged switches have no MAC address. Review the docs GS605v5 support pages  ... all models are the same.

What is the first half of the MAC address (this is the vendor OUI part) you can't associate logically with a device?

Note: There are universally administered address (UAA) when it's set by the manufacturer so most utilities can associate it with a vendor, or locally administered addresses (LAA) assigned by the system administrator or generated dynamically according to some rules.