INS is an acronym for Internet Naming Service. Files that contain the .ins file extension are commonly used to reconcile alphanumeric Web addresses into strictly numeric IP Web addresses. For example, if a website had a URL named www.websitename.com, that URL would be converted into a purely numeric IP address using the INS file format. This IP address would then be recognized by the necessary Web services.
The .ins file extension is also used for a computer user's Internet settings files. These files determine how the user's computer will access a dial-up or broadband Internet connection. These INS files are normally stored in a text-based format.
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