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Level 1: Joiner
Posts: 19
Registered: ‎23-07-2020

CGNAT - how does it work?

Hopefully one of you techies our there can help me.

By the sounds of it, o2 use CGNAT over mobile data?

How does CGNAT work, and how many users would be under one ‘public’ IP address at the same time on o2?

What exactly is CGNAT?
Posts: 117,695
Topics: 576
Registered: ‎04-04-2012

Re: CGNAT - how does it work?

https://en.wikipedia.org/wiki/Carrier-grade_NAT
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
Level 1: Joiner
Posts: 19
Registered: ‎23-07-2020

Re: CGNAT - how does it work?

@MI5 this is why I love this community, because other people do the research for you Smiley Wink

Still doesn’t make sense to me, how can each ISP/carrier know which individual user is browsing, when they are under the same IP as other users.

How many users would usually be behind one IP?
Posts: 117,695
Topics: 576
Registered: ‎04-04-2012

Re: CGNAT - how does it work?

@LW687 

That's got something to do with DNS https://en.wikipedia.org/wiki/Domain_Name_System

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)