Blacklist
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A blacklist is a simple lookup table or database of identifiers for systems to consider harmful. For the internet, a blacklist is often one of IP addresses, host names, or email addresses.
Blacklists are often used:
- by web servers to identify remote systems to block requests from based on IP address or domain name.
- by web sites to block spam form posts.
- by email servers to block spammers.
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