{"id":45465,"date":"2026-04-21T00:01:15","date_gmt":"2026-04-20T23:01:15","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=45465"},"modified":"2026-04-15T16:28:38","modified_gmt":"2026-04-15T15:28:38","slug":"fullfibre-limited-solves-ipv4-shortage-with-netelastic-bng-and-cgnat","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2026\/04\/fullfibre-limited-solves-ipv4-shortage-with-netelastic-bng-and-cgnat.html","title":{"rendered":"FullFibre Limited Solves IPv4 Shortage With netElastic BNG And CGNAT"},"content":{"rendered":"

Alternative UK broadband operator FullFibre Limited<\/a>, which in 2023 acquired rival Digital Infrastructure (BeFibre<\/a>) and in 2025 completed its merger with Zzoomm<\/a> (here<\/a>), has now apparently solved its “IPv4 shortage<\/em>” (internet addresses) with netElastic’s software and will be returning excess IPv4 blocks with the use of CGNAT (IP address sharing) being projected to save 40% over 3 years.<\/p>\n

Just to recap. The combined gigabit speed Fibre-to-the-Premises (FTTP<\/a>) broadband network currently reaches 600,000 UK premises<\/strong> (ready for service) and \u201cover<\/em>\u201d 90,000 customers<\/strong> (up from 80k in July 2025) across England \u2013 serving parts of approximately 110 market towns, which makes it one of the country\u2019s largest altnets. This reflects both their open access wholesale fibre network alongside their in-house retail ISP(s).<\/p>\n

NOTE:<\/strong> Zzoomm<\/a> was originally supported by \u00a3224m in capital = \u00a3100m debt via banks (here<\/a>), \u00a312m from private investors (\u201cbig chunk<\/em>\u201d of that comes from Matthew Hare) and \u00a3112m via Oaktree Capital<\/strong> (here<\/a>). By comparison, FullFibre Ltd was backed by investment from Basalt Infrastructure Partners LLP<\/strong>.<\/div>\n

However, the effort to slowly combine three networks (FullFibre, Digital Infrastructure and Zzoomm<\/a>) into a single entity, including the associated retail ISPs, did create some challenges. According to netElastic, this left the provider “battling limitations from their previous vendor regarding costly and time-consuming IP address acquisition<\/em>“, while also needing to scale its capacity to serve over 140,000 subscribers.<\/p>\n

For example, while evaluating upgrade solutions, FullFibre is said to have discovered that Juniper MX routers did not combine Broadband Network Gateway (BNG) and Carrier Grade Network Address Translation (CGNAT) while taking up two rack units each. But netElastic were able to offer a single box, one rack unit solution for BNG, CGNAT and netVision monitoring application.<\/p>\n

Running on standard x86 Dell XR servers with Intel Xeon Gold and 100G NICs, the networking software platform delivers routing, subscriber management and CGNAT with centralized GUI-based management. Returning excess IPv4 blocks with CGNAT is also projected to save 40% over three years, while halving rack space and power draw. FullFibre also discovered it could move DHCP onto the router itself. Lease times dropped from one hour to five minutes, allowing the network to detect and renegotiate lost connectivity much faster.<\/p>\n

Dave Bell, Head of Networks for FullFibre, said:<\/strong><\/p>\n

\u201cIf you\u2019re planning any major broadband network upgrade or consolidation, don\u2019t default to traditional hardware BNGs. Look seriously at software-based platforms like netElastic\u2019s \u2014 they give you the flexibility, massive cost savings, and the future-proofing you actually need in today\u2019s IPv4-scarce, high-growth environment.\u201d<\/p><\/blockquote>\n

Weixiao Liu, CEO of netElastic, said:<\/strong><\/p>\n

\u201cWe\u2019re proud to support FullFibre\u2019s ambitious growth journey with our integrated BNG and CGNAT solution. FullFibre\u2019s success shows exactly why service providers worldwide are moving to software networking: lower TCO, faster scaling, and the freedom to focus resources on customers instead of expensive legacy hardware.\u201d<\/p><\/blockquote>\n

Admittedly the greater use of IP address sharing (CGNAT) isn’t usually much of a positive selling point for the more technically minded pool of retail consumers, although full support for IPv6 often helps to mitigate some of the negatives. The good news is that FullFibre’s network is said to fully support IPv6 and likely runs most traffic on native IPv6. Similarly, their primary in-house ISP, which is now Zzoomm, has also long been known to support IPv6.<\/p>\n

A bunch of YouTube videos on all this can be found here<\/a>, although for some reason they’ve split one video up into several separate pieces, which is a bit unusual. Otherwise, there’s also a related case study document<\/a> (PDF), which adds a little bit more background on the change.<\/p>\n","protected":false},"excerpt":{"rendered":"

Alternative UK broadband operator FullFibre Limited, which in 2023 acquired rival Digital Infrastructure (BeFibre) and in 2025 completed its merger with Zzoomm (here), has now apparently solved its “IPv4 shortage” (internet addresses) with netElastic’s software and will be returning excess IPv4 blocks with the use of CGNAT (IP address sharing) being projected to save 40% […]<\/p>\n","protected":false},"author":1,"featured_media":32686,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[56,88,1867],"class_list":["post-45465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-fttp","tag-ipv6","tag-zzoomm"],"share_on_mastodon":{"url":"https:\/\/mastodon.social\/@ispreview\/116439527022850560","error":""},"yoast_head":"\nFullFibre Limited Solves IPv4 Shortage With netElastic BNG And CGNAT - ISPreview UK<\/title>\n<meta name=\"description\" content=\"Alternative UK broadband operator FullFibre Limited, which in 2023 acquired rival Digital Infrastructure (BeFibre) and in 2025 completed its merger with\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ispreview.co.uk\/index.php\/2026\/04\/fullfibre-limited-solves-ipv4-shortage-with-netelastic-bng-and-cgnat.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FullFibre Limited Solves IPv4 Shortage With netElastic BNG And CGNAT - 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