How to check the supplemental index?

To find out which of your pages are in the supplemental index, the most reliable technique is to compare your total pages indexed to the total pages in the main index (which can still be identified):

• To get total pages indexed, type into Google: site:www.yourdomain.com
• To get pages in the main index, type into Google: site:www.yourdomain.com -inallurl:www.yourdomain.com
• Pages in supplemental index = Total pages indexed – Pages in the main index.

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Counter the effects of supplemental index
There are steps you should take to counter the effects of the supplemental index