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The IPv6 Transition

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215 points todsacerdoti | 4 comments | 20 Oct 24 05:54 UTC | HN request time: 0.019s | source
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AStonesThrow ◴[21 Oct 24 05:51 UTC] No.41901025[source]▶
My ISP has given me a quite stable /64 network that's lasted for months and months.

I am curious though: my IPv6 network begins with 2600::, which I feel is not an accident or mere coincidence. For a long time, Facebook would never "trust" my device, and I suspected it was because of the IPv6 thing.

Now, "2600" is actually a hex number and doesn't mean 2600 decimal, but 2600 is an interesting prefix for a stable address. Could it mean that my ISP has permanently branded me as some sort of "hacker", and "2600" is network admin code for "please don't trust these devices"?

We should compare notes and see if other HN users have come up with stable prefixes like this, or different prefixes that aren't "2600".

replies(1): >>41902205 #
1. kevvok ◴[21 Oct 24 09:23 UTC] No.41902205[source]▶
According to the IANA assignment list, 2600::/12 is assognrd to ARIN.

https://www.iana.org/assignments/ipv6-unicast-address-assign...

replies(1): >>41906954 #
2. AStonesThrow ◴[21 Oct 24 18:30 UTC] No.41906954[source]▶
Yes, that's correct -- I'm in the USA, and not in Europe or Africa. What is your point with this? ARIN has, of course, delegated my assigned IPv6 network to my ISP; you do realize that this is SOP for ARIN?
replies(1): >>41911888 #
3. kevvok ◴[22 Oct 24 07:02 UTC] No.41911888[source]▶
The point was a prefix from 2600::/16 isn’t special; it’s just from one of the blocks assigned to ARIN. One ISP I know of with an allocation in that range is Verizon, which announces a number of prefixes over BGP in 2600:1000::/24
replies(1): >>41911941 #
4. AStonesThrow ◴[22 Oct 24 07:12 UTC] No.41911941{3}[source]▶
Uhm, anyone with an ISP in the United States is going to have a block delegated from ARIN. That's the whole point of ARIN, isn't it? Nothing they delegate is inherently special, because ARIN administers all of the allocations for their region.

I'm saying that perhaps the 2600::/16 delegation is especially reserved for a certain class of user in order to tag us as something. Surely, my own ISP holds more delegations than that slice alone. It's certainly standing out like a sore thumb to anyone analyzing logs. As I said, it can't be merely a coincidence.

Interestingly, I also subscribe to mobile voice/data service from the same ISP, and activating mobile data here at home gives me, sure enough, another 2600::* delegation.