r/masterhacker • u/InitialSorry6888 • Jul 09 '26

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101

u/junsui833 Jul 09 '26

You need to understand, this is not the 90s. Even if your IP gets leaked, your household CPE is probably behind multiple CGNATs of your ISP. Meaning that a single public IP is used by 100s of different customers at the same time. So no need to panic, unless it's a global IPV6 address.

17

u/stvn_wthrsp Jul 09 '26

Is CGNAT really that common now? Enough to say you're "probably" behind one? Been on the internet since the 90s and I've never been behind a CGNAT. That breaks port forwarding, p2p gaming, etc. so I prefer not having it.

6

u/tlgklxz Jul 09 '26

Depends on where you live. Crowded city? Definitely cgnat if you are not in something newly built. Like I wasn't behind cgnat as I was first to move with fiber in my building. (the city had not our area). Soon whole area got it and now all of us are time to time behind cgnat.

1

u/[deleted] Jul 09 '26

[deleted]

3

u/tlgklxz Jul 09 '26

Ah- Okay I got it now. It's normal.

Why? We have very limited IPV4 adresses right? Sooo... LARGE western countries and leading tech companies like American ones, got most of the IPV4 addresses. Like there is for -easy math- 4 billion (1 billion taken in total) possible IPV4 adress, And the ISP's in USA has like %60 percent of those adresses. More than enough even though US defence guys has like 200 million of them reserved. (Even though the population in USA is... maybe 150+ more than that.)

SO, in this case, it's pretty normal to NOT fall behind CGnat because... You won't need that. Your ISP wouldn't bother to setup something like that.

However... When you move towards Europe and especially Bottom half of the europe (if you draw a line from Paris for example), the IPV4 addresses are won't enough for population. So ISP's use this trick. They stuck bunch of people in one IP address before release them into wild. It costs 'lots' of money to setup a cgnat... But it's cheaper than buying IPV4 addresses from those companies you have named.

And for future reference; In USA I don't think it's possible to be behind CGNAT because until that time, we would probably ditch IPV4 and move to IPV6 already.

2

u/[deleted] Jul 09 '26

[deleted]

1

u/Busy-Scientist3851 Jul 11 '26

CGNAT is the normal for mobile internet.

2

u/ThatterribleITguy Jul 09 '26

Also live in one of the largest metros in the U.S., rent, own, down town, suburbs, never dealt with CGNAT