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2. 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.

3. 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.

4. 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 ...

5. 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]

6. Wikipedia:Blocking IP addresses - Wikipedia

   en.wikipedia.org/.../Wikipedia:Blocking_IP_addresses

   However, IP addresses should almost never be indefinitely blocked. Many IP addresses are dynamically assigned and change frequently from one person to the next, and even static IP addresses are periodically reassigned or have different users. In cases of long-term vandalism from an IP address, consider blocks over a period of months or years ...

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

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

   Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.