You'd need to create a custom 404 file, ensure your host actually is using it, then add the code to it to do all the checks you need. The simple solution is to just point all 404 pages to CB profiles. I wrote a post about the simple usage an extremely long time ago, but it might still work; you can find it below.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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krileon
