Great Migrations offers a VB6 / COM / ASP processor that can produce exactly what you ask for. These detailed "reference reports" are a side benefit of the main goal of the product, which is to help developers perform a special reinstallation of large VB6 / ASP / COM systems using tools on the C # / ASPX / .NET platform.
It takes a bit of work to configure gmStudio to process the ASP site (i.e. you need to tell which COM libraries are referenced and which site files are being downloaded), but after receiving this information it can accurately indicate which members of the COM libraries actually link (and where and how) the second report can tell you which members are not related (what you call “lost features”).
See the Great Migrations site for more details .