{"id":93337,"date":"2026-01-05T12:46:51","date_gmt":"2026-01-05T12:46:51","guid":{"rendered":"https:\/\/proxidize.com\/?post_type=blog&p=93337"},"modified":"2026-01-05T12:46:59","modified_gmt":"2026-01-05T12:46:59","slug":"what-is-ccgnat","status":"publish","type":"blog","link":"https:\/\/proxidize.com\/blog\/what-is-ccgnat\/","title":{"rendered":"What is Carrier Grade NAT (CGNAT)?"},"content":{"rendered":"\n

Carrier Grade NAT or CGNAT for short is a technique used by internet providers to conserve IPv4 addresses by allowing an ISP to assign multiple subscribers a shared public IP address. At its most simple, CGNAT could be described as a scaled up version of NAT<\/a>.<\/p>\n\n\n\n

While we covered carrier grade NAT in our NAT article briefly, this article will go more in depth about what CGNAT is, how it works, and how you can check if your ISP is running CGNAT.<\/p>\n\n\n\n

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What is CGNAT?<\/h2>\n\n\n\n

Carrier Grade Network Address Translation or CGNAT for short <\/strong>is a technique used by internet service providers (ISPs) to allow multiple customers to share a single public IPv4 address<\/strong>. It was created due to a shortage of IPv4 addresses \u2014 caused by IPv4 exhaustion on the one hand and the fact some countries have access to far fewer IPv4 ranges compared to countries that adopted the internet earlier on the other hand. No one could have predicted the meteoric rise of technology over the last twenty years, causing this drought of IPv4s. While IPv6 helps with the lack of IPv4s, it did not remove the need for IPv4.<\/p>\n\n\n\n

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CGNAT occurs at the ISP level rather than just within the home or business network<\/strong>. Carrier grade NAT is used for residential IP addresses in much of Eastern Europe, South America, the Middle East, and parts of Asia, and used in mobile networks worldwide. It\u2019s more common in these areas because ISPs have relatively fewer IPs allocated to them.<\/p>\n\n\n\n

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Difference Between NAT and CGNAT<\/h2>\n\n\n\n

Our earlier description that \u201cCGNAT is a larger-scale version of NAT<\/strong>\u201d is an oversimplification. NAT and CGNAT are different, which becomes more apparent in the specific differences.<\/p>\n\n\n\n

For starters, NAT is used at home or office routers<\/strong> to allow every device on that network to have a single, unique public-facing IP address<\/a>. NAT is used on a smaller scale to support tens to hundreds<\/strong> of people.<\/p>\n\n\n\n

By comparison, carrier grade NAT functions to assign thousands to millions of subscribers<\/strong> a public IP from the IP addresses the ISP has at its disposal, which leads us conveniently into our next topic.<\/p>\n\n\n\n

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How Does CGNAT Work?<\/h2>\n\n\n\n

CGNAT solutions are designed for far larger environments<\/strong> as it sustains throughput of hundreds of gigabytes per second and processes hundreds of thousands of new translations each second. There are three different architectures that exist for different network contexts<\/strong> and these are:<\/p>\n\n\n\n