activeco - 1:13 pm on Jul 19, 2009 (gmt 0)

I have a few sites where some pages are redirected (RewriteRule - 301) to a single one on another site.
The problem is that I can't find a way to find out from which site the page is being redirected, as the redirecting referer is not passed through.
I have tried almost everything related to mod-headers without success.
Any ideas?