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alert message significance

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I deleted an earlier identical question that included the actual address numbers. Each letter has a specific number value.

An alert message came up on my imac saying " IP configuration abc.ade.a.aff is in use by 90:21:55:00:db:c0.DHCP server abc.ade.a.a ".

MY ethernet IP address is abc.ade.a.acf I am not sure if my computer IP address is the same as the ethernet address.
Is this alert a security warning? Any help would be greatly appreciated. TIA

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