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Thanks for the great replies all.  Just to clarify, this is the page we're referencing: http://www.knackhq.com/business-directory-user-demo/?escaped_fragment= You can see the one pagination var "next" that points here: http://www.knackhq.com/business-directory-user-demo/?escaped_fragment=home/?view_3_page=2 As you can see this is pretty simple.  There's only one potential variable (the "prev" and "next" links) for introducing these huge numbers and that's pretty limited.  We tested the Google URLs up and down the app and haven't seen anything that would send it fishing for larger numbers.  But Google keeps hammering us with: GET /business-directory-user-demo/?escaped_fragment=home/?view_3_page=1000251 For now we're trying to respond to those with 404s and hope they eventually die. Unfortunately we can't avoid hashbangs.

Thanks, that most recent answer helped and confirmed our suspicions.  There is in fact a different website for each domain.  We will leave the old site in place for the time being and just link folks to the new one from there.  Thanks again and sorry about any confusion.