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IP address blocking

ip address blocking, ip address blocking software
IP address blocking prevents connection between a server or website and certain IP addresses or ranges of addresses IP address blocking effectively bans undesired connections from hosts using affected addresses to a website, mail server, or other Internet server

Unix-like operating systems commonly implement IP address blocking using TCP Wrapper, configured by host access control files /etc/hostsdeny and /etc/hostsallow

IP address blocking is commonly used to protect against brute force attacks 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 This is also useful for people who want to remotely access their computers It is also used for censorship

On a website, an IP address ban is often used to prevent a disruptive member from access, though a warning and/or account ban may be used first Dynamic allocation of IP addresses can complicate incoming IP address blocking, rendering it difficult to block a specific user without blocking a larger number of IP addresses blocks of IP address ranges, thereby risking collateral damage caused by ISPs sharing IP addresses of multiple Internet users

IP address blocking of the Showtime website for non-US origins

IP address banning is also used to limit the syndication of content to a specific region To achieve this, IP addresses are mapped to the countries they have been assigned to This has been used to devastating effect most recently to target Nigerian IP addresses due to the perception that all business emanating from the country is fraudulent, thus making it extremely difficult for legitimate businesses based in the country to interact with their counterparts in the rest of the world To make purchases abroad, Nigerians rely on proxy companies to mediate transactions

Proxy servers can be used to bypass an IP address ban unless the site being accessed has an effective anti-proxy script

In a 2013 court ruling on Craigslist v 3Taps, US federal judge Charles R Breyer decided that circumventing IP blocks in order to access a website for example using anoynymous proxies is a violation of CFAA, punishable by civil damages for "unauthorized access"


  1. ^ HOSTS_ACCESS5 FreeBSD man page Wietse Venema
  2. ^ Eckersley, Peter "Six Tips to Protect Your Search Privacy" Electronic Freedom Foundation Retrieved 17 April 2014 
  3. ^ "IP Cloaking Violates Computer Fraud and Abuse Act, Judge Rules" WIRED 20 August 2013 

External links

  • Works related to IP address blocking at Wikisource
  • Media related to IP address blocking at Wikimedia Commons

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IP address blocking

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