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2. IP address blocking - Wikipedia

   en.wikipedia.org/wiki/IP_address_blocking

   IP address blocking or IP banning is a configuration of a network service that blocks requests from hosts with certain IP addresses.IP address blocking is commonly used to protect against brute force attacks and to prevent access by a disruptive address.

3. 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.

4. Reserved IP addresses - Wikipedia

   en.wikipedia.org/wiki/Reserved_IP_addresses

   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

5. Block (Internet) - Wikipedia

   en.wikipedia.org/wiki/Block_(Internet)

   On the Internet, a block or ban is a technical measure intended to restrict access to information or resources. Blocking and its inverse, unblocking, may be implemented by the owners of computers using software. [1] Blocking may also refer to denying access to a web server based on the IP address of the client machine. [2]

6. Fail2ban - Wikipedia

   en.wikipedia.org/wiki/Fail2ban

   Fail2ban is similar to DenyHosts [...] but unlike DenyHosts which focuses on SSH, fail2ban can be configured to monitor any service that writes login attempts to a log file, and instead of using /etc/hosts.deny only to block IP addresses/hosts, fail2ban can use Netfilter/iptables and TCP Wrappers /etc/hosts.deny. —

7. Wikipedia:Blocking IP addresses - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Blocking_IP...

   If you block an IP address in any of the following ranges, you are required to immediately notify the Wikimedia Foundation Communications Committee.These ranges are allocated to major governmental organizations and blocks of these organizations have political and public relations implications that must be managed by the Foundation's press relations team.