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Better Internet

One IP address, many users: detecting CGNAT to reduce collateral effects

2025-10-29

ResearchWAFWeb Application FirewallBetter InternetSecurityBotsIPv4Network Services

IPv4 scarcity drives widespread use of Carrier-Grade Network Address Translation, a practice in ISPs and mobile networks that places many users behind each IP address, along with their collected activity and volumes of traffic. We introduce the method we’ve developed to detect large-scale IP sharing globally and mitigate the issues that result. ...

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