DNS servers may be well-suited to block domain names, for example, but not URLs. The type of element blocked is influenced by the access control location. A greylist contains items that are temporarily blocked (or temporarily allowed) until an additional step is performed.īlacklists can be applied at various points in a security architecture, such as a host, web proxy, DNS servers, email server, firewall, directory servers or application authentication gateways. The opposite is a whitelist, allowlist, or passlist, in which only items on the list are let through whatever gate is being used. Those items on the list are denied access. In computing, a blacklist, disallowlist, blocklist, or denylist is a basic access control mechanism that allows through all elements (email addresses, users, passwords, URLs, IP addresses, domain names, file hashes, etc.), except those explicitly mentioned. Screenshot of a web page of a Wikimedia Foundation project.
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