A blacklist is a list of entities, such as IP addresses, domains, or email addresses, that are blocked from accessing a network, system, or service due to malicious behavior or suspicious activity.
• Used by firewalls and email filters to block traffic from known malicious IP addresses or domains.• Employed by spam filters to prevent unwanted emails from reaching inboxes.
The purpose is to block access to entities that have been identified as a threat, such as malware-distributing domains or malicious IP addresses.
Blacklists are maintained by security teams or automated systems, which update them based on threat intelligence and new discoveries of malicious activity.
A blacklist blocks certain entities, while a whitelist allows only specific entities to access a system, creating a more restrictive security environment.
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