Get Non Constituent Records?

I'm curious if anyone else has this problem. We have a lot of addresses that pull into the GET address lists (all constituent) endpoint that do not have a matching record that pulls from the GET constituent list (all constituent) endpoint. Upon further investigation these records are people that do not have full constituent records in our database. Is there any API solution that will allow us to pull the names of these records? I can run a single call per id number, but that would eat up thousands of calls.  

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