De-Listing

The removal of pages from a search engine's index.

Removal can occur for various reasons, including unreliability of the machine that hosts a site or because of perceived attempts at spamdexing.

Temporarily or permanently becoming de-indexed from a directory or search engine. De-indexing may be due to any of the following: Pages on new websites (or sites with limited link authority relative to their size) may be temporarily de-indexed until the search engine does a deep spidering and re-cache of the web. During some updates search engines readjust crawl priorities. You need a significant number of high quality links to get a large website well indexed and keep it well indexed. Duplicate content filters, inbound and outbound link quality, or other information quality related issues may also relate to re-adjusted crawl priorities. Pages which have changed location and are not properly redirected, or pages which are down when a search engine tries to crawl them may be temporarily de-indexed. Search Spam: If a website tripped an automatic spam filter it may return to the search index anywhere from a few days to a few months after the problem has been fixed. If a website is editorially removed by a human you may need to contact the search engine directly to request reinclusion.