Is there a way to identify which ESX a guest is sitting on from the guest OS?
That is something which is not wanted because of security reasons. So it is not possible with VMware native tools.
There are already some older threads about this issue around here.
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AWo
VCP / vEXPERT 2009
I know your question states to know from the guest OS, but you can get this information from the ESX host service console by typing "vmware-cmd -l".
Hope this helps!