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Shared IP addresses, such as universities, schools, and ISPs are often badly affected by open proxies on their networks; in some cases it may be worth considering a softblock and/or a checkuser instead of a hardblock. Wikipedia:IP block exemption is also available for legitimate registered users.
Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.
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.
Special address blocks Address block (CIDR) First address Last address Number of addresses Usage Purpose ::/128 :: :: 1 Software Unspecified address
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.
Logo for the Wikipedia CheckUser tool and the checkuser team. A CheckUser is a Wikipedia user account that actively holds the CheckUser user permissions. It is a functionary-level of privileged access that is granted to a small group of trusted Wikipedia users, which allows them to access the CheckUser tool and its features.
Additionally, because of the creation of the IP block exemption flag, editors, like those in China, who have a demonstrated need to use proxies or Tor to edit may be given the ability to edit from blocked IPs. See Wikipedia:IP block exemption § Used for anonymous proxy editing for more.
Unblocking an IP or IP range with this template is highly discouraged without at least contacting the blocking administrator. Most proxy check tools and services will give a false negative for this type of proxy, and if you unblock it, the proxy checking bots will not automatically re-block it, even if it is still an open proxy.
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