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A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whether a sending host's IP address is blacklisted for email spam. [1]
Yet another form of list is the yellow list which is a list of email server IP addresses that send mostly good email but do send some spam. Examples include Yahoo, Hotmail, and Gmail. [citation needed] A yellow listed server is a server that should never be accidentally blacklisted. The yellow list is checked first and if listed then blacklist ...
The list includes wide networks of computers sharing the same IP address using network address translation which are also affected (If one computer behind the NAT is allowed to send spam, the whole network will be blacklisted if the NAT IP is ever blacklisted.) This is a common method of pre-emptive blocking as most legitimate mail servers are ...
Specific address range(s) used by imgur.com Image hosting: Technical issue with content lock system EE: October 2013: 22 November 2013 (Technical problem resolved) WordPress.com: Several servers of wordpress.com Blog hosting: Mistake ISP(s) [36] 26 November 2013: 5 December 2013: Imgur: imgur.com Image hosting: Technical implementation [37] Sky ...
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 ...
"IANA IPv4 Address Space Registry". Internet Assigned Numbers Authority (IANA). 21 December 2017 The authoritative up-to-date list of IANA assignments. "ARIN Whois Database". American Registry for Internet Numbers (ARIN) Historical IP address lists: "INTERNET PROTOCOL ADDRESS SPACE".
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.
During 2001 Xtra and Actrix (another New Zealand Internet service provider) won a High Court injunction to force Alan Brown, the maintainer of the Open Relay Behavior-modification System (ORBS) anti-spam blacklist, to remove them from the list. ORBS was a blacklist of IP addresses relating to open mail relays like those run by Xtra, which ...