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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. List of assigned /8 IPv4 address blocks - Wikipedia

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

   Starting 1991-06-01, was used to map Public Data Network addresses to IP addresses. Returned to IANA 2008-01-22. This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information. [10] 15.0.0.0/8 ARIN: 1991-09

4. CleanBrowsing - Wikipedia

   en.wikipedia.org/wiki/CleanBrowsing

   CleanBrowsing is a free public DNS resolver with content filtering, founded by Daniel B. Cid and Tony Perez. It supports DNS TLS over port 853 and DNS over HTTP over port 443 in addition to the standard DNS over port 53.

5. 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.

6. DNS blocking - Wikipedia

   en.wikipedia.org/wiki/DNS_blocking

   Domain Name System blocking, or DNS blocking / filtering, is a strategy for making it difficult for users to locate specific domains or websites on the Internet.It was first introduced in 1997 as a means to block spam email from known malicious IP addresses.

7. PeerBlock - Wikipedia

   en.wikipedia.org/wiki/PeerBlock

   PeerBlock is a free and open-source personal firewall that blocks packets coming from, or going to, a maintained list of blacklisted hosts. [2] PeerBlock is the Windows successor to the software PeerGuardian (which is currently maintained only for Linux). [3]