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2. IP address blocking - Wikipedia

   en.wikipedia.org/wiki/IP_address_blocking

   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.

3. 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]

4. PeerGuardian - Wikipedia

   en.wikipedia.org/wiki/PeerGuardian

   PeerGuardian is a free and open source program developed by Phoenix Labs (software).It is capable of blocking incoming and outgoing connections based on IP blacklists.The aim of its use was to block peers on the same torrent download from any visibility of your own peer connection using IP lists.

5. 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.

6. DNS blocking - Wikipedia

   en.wikipedia.org/wiki/DNS_blocking

   Instead of returning the valid IP address of a requested site (for example, instead of 198.35.26.96 being returned by the DNS when "www.wikipedia.org" is entered into a browser, [2] if this IP were on a block list, the DNS might reply that the domain is unknown or with a different IP address that directs to a site with a page stating that the ...

7. Wikipedia:WikiProject Open proxies/Guide to checking open ...

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

   Step one: You would normally first have reason to suspect that an IP is an open proxy. There may be a banned user or sockpuppets using IP addresses from different countries, or the vandal or other users might mention it directly. There might be an IP already blocked as an open proxy requesting unblock. The edit might malform some wikitext.