{"id":10725,"date":"2024-06-27T10:08:54","date_gmt":"2024-06-27T08:08:54","guid":{"rendered":"https:\/\/cyberinsights.iainfraser.net\/?p=10725"},"modified":"2024-06-28T10:48:23","modified_gmt":"2024-06-28T08:48:23","slug":"what-is-a-dnsbl","status":"publish","type":"post","link":"https:\/\/smecyberinsights.co.uk\/index.php\/2024\/06\/27\/what-is-a-dnsbl\/","title":{"rendered":"THREAT INTEL: What is a DNSBL? A Domain Name System Blacklist ‘helps’ to fight email spammers."},"content":{"rendered":"\t\t
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Gibraltar: Thursday 27 June\u00a0 2024 at 11:50 CET<\/p>\n

THREAT INTEL: What is a DNSBL? – A DNSBL or A DNSBL or Domain Name System Blacklist is a part of a system that ‘helps’ to fight email spammers.<\/strong><\/p>\n

By Andy Jenkinson \u2013 Guest Contributor |\u00a0 Group CEO\u00a0Cybersec Innovation Partners<\/a>
\nvia\u00a0IainFRASER.net\/CYBERInsights<\/a>
\nFirst for\u00a0SME Cybersecurity News<\/a>
\nGoogle Indexed on 270624 at 12:00 CET<\/a><\/p>\n

#SMECyberInsights #SMECyberNews #Cybersecurity #WhitethornShield #InternetSecurity #Cybercrime #DNS #PKI<\/em><\/p>\n

A DNSBL or Domain Name System Blacklist is a part of a system that ‘helps’ to fight email spammers. There are a lot of such lists in existence, each of them containing a list of IP addresses known to send spam.<\/strong><\/p>\n

DNS<\/strong> blacklists are used by email services and website admins to effectively keep spam out of their clients\u2019 inboxes. Think of such lists as bouncers, but instead of having a list of people to let in, they contain lists of people to keep out.<\/p>\n

Despite its name, the term \u201clist\u201d is an oversimplification. These \u201cblacklists\u201d are not simply lists but rather security mechanisms that utilize various methods of checking whether or not a specific address or domain is listed, gets listed, or is removed from the list. These lists can also sometimes be referred to as \u201cblocklists\u201d.<\/p>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PDNS<\/strong> is similar in the fact it collects information, retrospectively on known rogue IP addresses used for malicious purposes to block them. Both DNSBL<\/strong> and PDNS<\/strong> are reliant on the information being shared ‘after the event’ and populated into lists.<\/p>\n

Neither DNSBL<\/strong> nor PDNS<\/strong> are a substitute to proactive DNS<\/strong> controls and management.<\/p>\n

The single IP address below has a total of 9 out of the 24 most popular on the DNSBL<\/strong>. One of those using this provider and the ASN<\/strong> is Gartner<\/a><\/strong>. The server is based in Washington DC and also has nearly 30 million IPv4 addresses, over 100,000 domains hosted, 30 adult domains, and 52 Spam hosts.<\/p>\n

Still think DNS doesn’t matter …?<\/p>\n

Cybersec Innovation Partners<\/a>
\nThe White House<\/a>
\nFBI Cyber Division<\/a>
\nCentral Intelligence Agency<\/a>
\nGCHQ<\/a>
\nJisc<\/a>
\nInformation Commissioner’s Office<\/a>
\nSerious Fraud Office (UK)<\/a>
\nMetropolitan Police<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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About Andy Jenkinson<\/span><\/strong><\/p>\n

Group CEO CIP. Fellow Cyber Theory Institute. Director Fintech & Cyber Security Alliance (FITCA) working with Governments. Recognised Expert in Internet Asset & DNS Vulnerabilities.<\/span><\/strong><\/p>\n

Andy Jenkinson is a senior and seasoned innovative Executive with over 30 years\u2019 experience as a hands-on lateral thinking CEO, coach, and leader. A \u2018big deal\u2019 business accelerator, and inspirational, lateral thinker, Andy has crafted, created, and been responsible for delivering 100\u2019s \u00a3 millions of projects within the Cyber, Technical, Risk and Compliance markets for some of the world\u2019s largest, leading organisations. Andy has a demonstrable track record of largescale technical delivery and management within many sectors including the Professional, Managed, and Financial Services.<\/p>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Image Credit: RecuperaData\/Flickr Learn More \/… Learn More \/…<\/p>\n","protected":false},"author":1,"featured_media":10728,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"cybocfi_hide_featured_image":"yes","footnotes":""},"categories":[440],"tags":[439],"ppma_author":[505],"class_list":["post-10725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cyberthreat-intel","tag-cyberthreat-intel"],"featured_image_urls":{"full":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS.jpg",800,600,false],"thumbnail":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS-150x150.jpg",150,150,true],"medium":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS-300x225.jpg",300,225,true],"medium_large":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS-768x576.jpg",640,480,true],"large":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS.jpg",640,480,false],"1536x1536":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS.jpg",800,600,false],"2048x2048":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS.jpg",800,600,false],"covernews-featured":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS.jpg",800,600,false],"covernews-medium":["https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/06\/Image_RecuperaData_Flickr_DNS-540x340.jpg",540,340,true]},"author_info":{"display_name":"Cybersecurity Journalist Iain Fraser","author_link":false},"category_info":"SME CYBER\/THREAT INTEL<\/a>","tag_info":"SME CYBER\/THREAT INTEL","comment_count":"0","authors":[{"term_id":505,"user_id":1,"is_guest":0,"slug":"admin_yjdstq4n","display_name":"Cybersecurity Journalist Iain Fraser","avatar_url":{"url":"https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/10\/index_image440-removebg-preview.png","url2x":"https:\/\/smecyberinsights.co.uk\/wp-content\/uploads\/2024\/10\/index_image440-removebg-preview.png"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/10725","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=10725"}],"version-history":[{"count":0,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/10725\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/media\/10728"}],"wp:attachment":[{"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=10725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/categories?post=10725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/tags?post=10725"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/smecyberinsights.co.uk\/index.php\/wp-json\/wp\/v2\/ppma_author?post=10725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}