How do I make a 404 page crawler

I need some direction on how to make a 404 page crawler for internal page development.
I should write to a log file or somthing.

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Tony McCreathTechnical SEO ConsultantCommented:
I don't quite understand your question.

Are you asking for a tool that crawls your internal website and finds links to missing pages?
gvilla23Author Commented:
yes, its only for internal use.
Tony McCreathTechnical SEO ConsultantCommented:
Theres a free tool called xenu which did most of what I wanted:

There are quite a few tools out there. Try the following google searches:

link checker
link varifier
website link verifier
website link crawler

I'm also working on one myself. currently in alpha stage... 

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