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A comment on The FBI's internal guide for getting data from AT&T, T-Mobile, Verizon. Parent comment

Re:The FBI's internal guide for getting data from AT&T, T-Mo... by bibaheu on Monday October 25, 2021 @03:00PM (#28991718)
Probably IPv4 is on CGNAT and Sprint doesn't keep the logs of the translation. On IPv6 there's no NAT, and there might be a deterministic relationship between subscription and IP
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Re:The FBI's internal guide for getting data from AT&T, T-Mo... by glogla on Monday October 25, 2021 @03:03PM (#28991752)
That, or they don't give devices IPv4 addresses at all and run 464XLAT - according to Wikipedia, quite a few telcos do it that way.
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Re:The FBI's internal guide for getting data from AT&T, T-Mo... by p1mrx on Monday October 25, 2021 @04:30PM (#28992746)
464XLAT is a form of CGNAT.

The main difference is whether the subscriber side uses an IPv6 or private IPv4 address, but on the internet side they are equivalent.

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Re:The FBI's internal guide for getting data from AT&T, T-Mo... by keneda7 on Monday October 25, 2021 @03:28PM (#28992036)
I believe you are correct.

https://news.ycombinator.com/item?id=16440850

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