{"id":34363,"date":"2026-09-16T12:58:17","date_gmt":"2026-09-16T12:58:17","guid":{"rendered":"https:\/\/blog.lacnic.net\/?p=34363"},"modified":"2026-09-16T12:58:36","modified_gmt":"2026-09-16T12:58:36","slug":"asn-only-region","status":"publish","type":"post","link":"https:\/\/blog.lacnic.net\/en\/asn-only-region\/","title":{"rendered":"Study of ASN-Only Organizations in the LACNIC Region"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">By <a href=\"https:\/\/blog.lacnic.net\/en\/author\/alejandro-acosta\/\">Alejandro Acosta<\/a> and <a href=\"https:\/\/blog.lacnic.net\/en\/author\/elisa-peirano\/\">Elisa Peirano<\/a>, LACNIC<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a>Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a><\/a>This analysis examines recent trends related to ASN-Only organizations and their impact on RIRs, particularly LACNIC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is an ASN-Only Organization?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a><\/a>The term \u201cASN-Only organization\u201d refers to an organization or institution that has been allocated an Autonomous System Number (ASN) but does not hold any IPv4 or IPv6 prefixes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reason for the Study<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">We aim to understand the impact of ASN-Only requests by answering the following questions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do these organizations announce IPv4 prefixes?<\/li>\n\n\n\n<li>Do these organizations announce IPv6 prefixes?<\/li>\n\n\n\n<li>What is the size of the announced prefixes?<\/li>\n\n\n\n<li>How many prefixes are announced?<\/li>\n\n\n\n<li>What is their RPKI status?<\/li>\n\n\n\n<li>Which RIR allocated each announced prefix?<\/li>\n\n\n\n<li>Which ASNs are not visible in the DFZ?<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">General Information<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are currently 522 ASN-Only organizations in the LACNIC region. Of these, 215 ASNs announce IPv4 and\/or IPv6 prefixes on the Internet. Specifically, these ASNs announce 1,069 IPv4 prefixes and 64 IPv6 prefixes. In total, 216 ASNs are visible in the DFZ.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ASN-Only organizations are distributed across countries in the LACNIC region as follows:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"718\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig1-asn-only-region-1024x718.png\" alt=\"\" class=\"wp-image-34348\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig1-asn-only-region-1024x718.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig1-asn-only-region-300x210.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig1-asn-only-region-470x330.png 470w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig1-asn-only-region-768x539.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig1-asn-only-region.png 1052w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a>Size of Advertised Prefixes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The images below show the size distribution of announced IPv4 prefixes (left) and IPv6 prefixes (right). As expected, the most frequently announced prefix lengths are \/24 for IPv4 and \/48 for IPv6.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"868\" height=\"806\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig2-asn-only-region.png\" alt=\"\" class=\"wp-image-34351\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig2-asn-only-region.png 868w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig2-asn-only-region-300x279.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig2-asn-only-region-355x330.png 355w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig2-asn-only-region-768x713.png 768w\" sizes=\"(max-width: 868px) 100vw, 868px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"708\" height=\"658\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig3-asn-only-region.png\" alt=\"\" class=\"wp-image-34354\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig3-asn-only-region.png 708w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig3-asn-only-region-300x279.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig3-asn-only-region-355x330.png 355w\" sizes=\"(max-width: 708px) 100vw, 708px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a>Origin of Advertised Prefixes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It is also interesting to note the origin of the prefixes announced by these ASNs. As the data show, most originate in the LACNIC region. However, prefixes allocated by ARIN and RIPE NCC\u2014and, to a lesser extent, by APNIC and AFRINIC\u2014are also announced.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>RIR<\/strong><\/td><td><strong>IPv4 Resources<\/strong><\/td><td><strong>IPv6 Resources<\/strong><\/td><td><strong>Total<\/strong><\/td><td><strong>Percentage<\/strong><\/td><\/tr><\/thead><tbody><tr><td>AFRINIC<\/td><td>5<\/td><td>0<\/td><td>5<\/td><td>0.44%<\/td><\/tr><tr><td>APNIC<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0.09%<\/td><\/tr><tr><td>ARIN<\/td><td>154<\/td><td>4<\/td><td>158<\/td><td>13.94%<\/td><\/tr><tr><td>LACNIC<\/td><td>846<\/td><td>59<\/td><td>905<\/td><td>79.88%<\/td><\/tr><tr><td>RIPE NCC<\/td><td>63<\/td><td>1<\/td><td>64<\/td><td>5.65%<\/td><\/tr><tr><td><strong>Global<\/strong><\/td><td><strong>1069<\/strong><\/td><td><strong>64<\/strong><\/td><td><strong>1133<\/strong><\/td><td><strong>100%<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Which RIRs allocated the prefixes announced in each country?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examining the data at the country level shows which RIRs allocated the prefixes announced by ASN-Only organizations in each country.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"657\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig4-asn-only-region-1024x657.png\" alt=\"\" class=\"wp-image-34357\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig4-asn-only-region-1024x657.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig4-asn-only-region-300x193.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig4-asn-only-region-514x330.png 514w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig4-asn-only-region-768x493.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig4-asn-only-region.png 1162w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As the image shows, Brazil is the only country that announces APNIC prefixes, while Mexico and Venezuela are the only countries that announce AFRINIC prefixes. Uruguay announces only one ARIN prefix, while Paraguay announces only one RIPE NCC prefix. <a><\/a>In total, 16 countries in the region announce ARIN prefixes, while seven announce RIPE NCC prefixes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">RPKI Adoption<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Of the 215 ASNs that announce prefixes, 138 have at least one valid ROA. The remaining ASNs have invalid or unknown ROA status.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The chart below shows the number of IPv4 and IPv6 prefixes by ROA status.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"651\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region-1024x651.png\" alt=\"\" class=\"wp-image-34360\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region-1024x651.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region-300x191.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region-519x330.png 519w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region-768x489.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region-1536x977.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/fig5-asn-only-region.png 1814w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a>DFZ<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A total of 216 ASNs are visible in the DFZ: 189 announce only IPv4 prefixes, six announce only IPv6 prefixes, and 21 announce both IPv4 and IPv6 prefixes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a><\/a>Of the 1,067 IPv4 prefixes visible in the DFZ, 592 have VALID RPKI status, 470 have UNKNOWN status, and four have INVALID status. Of the 64 IPv6 prefixes announced in the DFZ, 38 have VALID ROAs and 26 have UNKNOWN status.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This study analyzes 522 ASN-Only organizations in the LACNIC region. Of these, only 216 announce prefixes on the network (primarily IPv4 \/24s) while 306 remain invisible in the DFZ. The findings show that 79.88% of the announced resources are from LACNIC, with substantial use of ARIN resources, and that 120 ASNs validate their prefixes using RPKI.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To summarize:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Most announced address space was allocated by LACNIC, ARIN, or RIPE NCC. A small number of prefixes allocated by APNIC and AFRINIC are also observed.<\/li>\n\n\n\n<li>IPv4 prefixes are highly fragmented into small networks. Of all announcements, 90.3% are \/24s (966 prefixes), the standard minimum prefix length generally accepted in the global BGP routing table.<\/li>\n\n\n\n<li>IPv6 deployment is dominated by \/48 prefixes (62.5%).<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>By Alejandro Acosta and Elisa Peirano, LACNIC Introduction This analysis examines recent trends related to ASN-Only organizations and their impact on RIRs, particularly LACNIC. What is an ASN-Only Organization? The term \u201cASN-Only organization\u201d refers to an organization or institution that has been allocated an Autonomous System Number (ASN) but does not hold any IPv4 or [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":34345,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[919],"tags":[1280],"archivo":[1345,1451],"taxonomy-authors":[1248,1375],"tipo_autor":[],"class_list":["post-34363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-routing","tag-routing","archivo-editions","archivo-highlights-2023","taxonomy-authors-alejandro-acosta-en","taxonomy-authors-elisa-peirano-en"],"acf":{"author":"","related_notes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LACNIC Blog | Study of ASN-Only Organizations in the LACNIC Region<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.lacnic.net\/en\/asn-only-region\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LACNIC Blog | Study of ASN-Only Organizations in the LACNIC Region\" \/>\n<meta property=\"og:description\" content=\"By Alejandro Acosta and Elisa Peirano, LACNIC Introduction This analysis examines recent trends related to ASN-Only organizations and their impact on RIRs, particularly LACNIC. What is an ASN-Only Organization? The term \u201cASN-Only organization\u201d refers to an organization or institution that has been allocated an Autonomous System Number (ASN) but does not hold any IPv4 or [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.lacnic.net\/en\/asn-only-region\/\" \/>\n<meta property=\"og:site_name\" content=\"LACNIC Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/lacnic\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-16T12:58:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-16T12:58:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2026\/09\/asn-only-region.png\" \/>\n\t<meta property=\"og:image:width\" content=\"680\" \/>\n\t<meta property=\"og:image:height\" content=\"330\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Gianni\" \/>\n<meta name=\"twitter:card\" 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