Can host entry be managed in IIS

My server runs IIS. To use the service for a specific email html page, I call a service on another server.
Right now I an using the features in the HOST file. I.e.                 localhost      # captula service

This seems like a crude way to handle this issue as it requires an error or I have to use #PRE.

There must be some better way in IIS but I can not find it Anyone who knows the inner working of IIS well will be able to supply this information.

Many thanks in advance.
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obvious question: why not use DNS?


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