incrediBILL - 4:36 pm on Mar 26, 2008 (gmt 0)

Is this a custom script

Yes, it's custom - I don't know anything out there that does this either open source or for sale. Besides, it's not static, nothing you can just run once a week and assume it works. Some domain parks or other types of sites that I can accurately detect one week can change their template and slip through the cracks the next week so the link checker is always evolving to keep pace with the web.