alt Hacker NewsBecause the internet as a whole is ipv4. The mobiles are IPv6. The ipv4 internet does not care about any server running on any mobile device.
Thus, CG Nat was invented so that IPv6 could talk to IPv4 and get the information from it.
Replies
nulbyte • 01/03/2026
No, NAT64 was invented so v6-only hosts could access v4-only resources. CGNAT was invented so v4 hosts can have a v4 address without having to purchase limited public address space.
No, CGNAT (Carrier-Grade NAT - https://en.wikipedia.org/wiki/Carrier-grade_NAT) is an IPv4 only thing. https://www.rfc-editor.org/rfc/rfc6598 specifies they should use 100.64.0.0/10 for it, to avoid conflicting with the pre-existing private-use ranges. IPv6 removes the need for using CGNAT, as each home router is allocated a public IP (rather than a CGNAT IP) on its public link.