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===Security concerns=== If a malicious actor using a cgNAT IP address gets blacklisted by a server/website then all users sharing the same cgNAT IP will also get blacklisted. <ref name=":1">{{Cite web |last=Asturias |first=Diego |date=21 Jul 2025 |title=CGNAT: The Workaround to IPv4 Depletion [2025] |url=https://www.rapidseedbox.com/blog/cgnat |website=rapidseedbox.com}}</ref> A DDoS attack targeted at one user behind a cgNAT IP address affects all users behind that address, which can disrupt service for entire neighborhoods. <ref>{{Cite web |last=Newman |first=Sean |date=8 Mar 2022 |title=There Goes the Neighborhood: The DDoS Disadvantages of Carrier Grade NAT |url=https://www.corero.com/ddos-disadvantages-of-carrier-grade-nat/ |website=corero.com}}</ref><ref>{{Cite web |last=Turner |first=Glen |date=1 Oct 2019 |title=The Effect of DDoS Attacks on Carrier-grade NAT Devices |url=https://www.a10networks.com/resources/videos/the-effect-of-ddos-attacks-on-carrier-grade-nat-devices/ |website=a10networks.com}}</ref><ref name=":1" />
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