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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] Most mail server software can be configured to check such lists, typically rejecting or flagging messages from such sites.
A DNSBL is a software mechanism, rather than a specific list or policy. Dozens of DNSBLs exist.[2] They use a wide array of criteria for listing and delisting addresses. These may include listing the addresses of zombie computers or other machines being used to send spam, Internet service providers (ISPs) who willingly host spammers, or those which have sent spam to a honeypot system.
Since the creation of the first DNSBL in 1998, the operation and policies of these lists have frequently been controversial,[3][4] both in Internet advocacy circles and occasionally in lawsuits. Many email systems operators and users[5] consider DNSBLs a valuable tool to share information about sources of spam, but others including some prominent Internet activists have objected to them as a form of censorship.[6][7][8][9] In addition, a small number of DNSBL operators have been the target of lawsuits filed by spammers seeking to have the lists shut down.[10]
^"What is a DNSBL". DNSBL.info. Retrieved 21 June 2020.
^"DNS & RHS blackhole lists". Archived from the original on 2013-03-21. Retrieved 2013-03-26.
^Lewis, Chris; Sergeant, Matt. Overview of best email DNS-based list (DNSBL) operational practices. doi:10.17487/RFC6471. RFC 6471. Retrieved 2020-05-25.
^"RBLMon.com: What are RBLs and How do they Work?". Archived from the original on 2017-09-04. Retrieved 2013-03-26.
^"Revealing Botnet Membership Using DNSBL Counter-Intelligence" (PDF). Retrieved 2013-03-26.
^"RBL Criticism". 11 February 2008. Retrieved 2013-03-26.
A DomainNameSystemblocklist, DomainNameSystem-based blackhole list, DomainNameSystem blacklist (DNSBL) or real-time blackhole list (RBL) is a service...
recursive name server (also called public DNS resolver) is a name server service that networked computers may use to query the DomainNameSystem (DNS),...
latter server deploys RPZ, and either the queried name or the resulting address are in the blocklist, the response is modified so as to impede access....
search for names of Anti-P2P companies and set a status code in the entry to make the blocklists that would be downloaded by the blocklist manager for...
bridges the OpenNIC system and Namecoin. Some OpenNIC DNS servers made use of a Spamhaus-maintained blocklist of malicious .bit domains. ICANN Namecoin Open...
certain domains in order to cut down on spam, and for this reason, known URL redirection services are often themselves added to spam blocklists. Another...
email system performs many of the functions of a general-purpose DBMS such as message insertion, message deletion, attachment handling, blocklist lookup...
ability to identify its precise host. Ernsto (28 October 2016). "UK Piracy Blocklist Expands With 123movies and Other Streaming Sites". Retrieved 22 February...
restrictions on Internet content hosted within Australia, and maintain a blocklist of overseas websites which is then provided for use in filtering software...
and Russia (in November 2018). On March 23, 2024, the Dutch pirate site blocklist has been reported to now include Anna's Archive and Library Genesis, based...
eNom, a private domainname registrar and Web hosting company operating in the US, disables domainnames that appear on the blocklist. It describes eNom's...
(DoT) is a network security protocol for encrypting and wrapping DomainNameSystem (DNS) queries and answers via the Transport Layer Security (TLS) protocol...
2013. Ernesto (14 December 2014). "Former 'Pirate' site dropped from UK blocklist". Archived from the original on 16 December 2014. Retrieved 14 December...
"<unwanted site>". Users could also use the Google Chrome extension "Personal Blocklist (by Google)", launched by Google in 2011 as part of countermeasures against...
DNS over HTTPS (DoH) is a protocol for performing remote DomainNameSystem (DNS) resolution via the HTTPS protocol. A goal of the method is to increase...
Retrieved 16 January 2009. Sullivan, Sean (16 January 2009). "Preemptive Blocklist and More Downadup Numbers". F-Secure. Archived from the original on 2...
but less than 1% in 2002. Because of spam concerns most email providers blocklist open relays, making original SMTP essentially impractical for general...
RFCs.) Callback verification is abusive and can lead to blocklisting of the server, the domain or the IP block. If the admin of the mail server has disabled...
browser from compromising the whole operating system. Internet Explorer 4 and later allows the blocklisting and allowlisting of ActiveX controls, add-ons...
words found in a password blocklist prohibition of words found in the user's personal information prohibition of use of company name or an abbreviation prohibition...
adding legitimate sites to its blocklists almost instantaneously, as opposed to the several hours it took for blocklists to be updated on other browsers...
The Domain Block List was released in March 2010 and is a list of domainnames, which is both a domain URI blocklist and RHSBL. It lists spam domains including...
networks and various other information from sources such as IP and domainblocklists. Analyze – The TIP automatically analyzes the content of threat indicators...
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