I think firstly you should watch the video, as you can see it’s from SEOmoz, which is a top ranked SEO Company (based in Seattle). This video demonstrates the fundamentals of the supplemental index and is very helpful (noobs or elite).

Webopedia defines the supplemental index as:

In search engines, a supplemental index is comprised of Web results compiled with fewer restraints on sites than sites that are crawled for a main search engine index. Google is one search engine that uses both a main index and a supplemental index. In some instances restrictions for inclusion in the main index may be ignored allowing your Web site to be crawled by the supplemental index, or the supplemental index crawls those pages that the main index had difficulty with. Web pages that are listed in a supplemental index usually are not returned as results in Web search queries as often as those included by the main search index.

So we can see it is an index that is easier to get in to, especially if you messed up your pages in some way. Additionally, they don’t return in general search results. I see it as a staging area for pages that require repair.

Now lets identify your sites indexed pages and pages in the supplemental. Load Google Search and type in for example site:seocog.com this will show you all of your indexed pages in the MAIN search index. Now add *** -sjpked or *** -s to the end and it like this site:www.simplesem.com *** -sjpked now you see the pages contained in the supplemental index.

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