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  2. IP address blocking - Wikipedia

    en.wikipedia.org/wiki/IP_address_blocking

    IP address blocking is possible on many systems using a hosts file, which is a simple text file containing hostnames and IP addresses. Hosts files are used by many operating systems, including Microsoft Windows, Linux, Android, and OS X.

  3. Fail2ban - Wikipedia

    en.wikipedia.org/wiki/Fail2ban

    Most commonly this is used to block selected IP addresses that may belong to hosts that are trying to breach the system's security. It can ban any host IP address that makes too many login attempts or performs any other unwanted action within a time frame defined by the administrator. It includes support for both IPv4 and IPv6.

  4. PeerBlock - Wikipedia

    en.wikipedia.org/wiki/PeerBlock

    PeerBlock is the Windows successor to the software PeerGuardian (which is currently maintained only for Linux). [3] It blocks incoming and outgoing connections to IP addresses that are included on blacklists (made available on the Internet), and to addresses specified by the user. [3] PeerBlock mainly uses blacklists provided by iblocklist.com. [4]

  5. Reserved IP addresses - Wikipedia

    en.wikipedia.org/wiki/Reserved_IP_addresses

    Used for loopback addresses to the local host [1] 169.254.0.0/16 169.254.0.0–169.254.255.255 65 536: Subnet Used for link-local addresses [5] between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server 172.16.0.0/12 172.16.0.0–172.31.255.255 1 048 576: Private ...

  6. List of assigned /8 IPv4 address blocks - Wikipedia

    en.wikipedia.org/.../8_IPv4_address_blocks

    Each / 8 block contains 256 3 = 2 24 = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address. This means that 256 /8 address blocks fit into the entire IPv4 space.

  7. Blacklist (computing) - Wikipedia

    en.wikipedia.org/wiki/Blacklist_(computing)

    Screenshot of a website blocking the creation of content which matches a regular expression term on its blacklist. 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.

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