I'd be just as gutted if they ever pull the plug on ipv6.google.com <http://ipv6.google.com/> - it's my go-to "first attempt" for an IPv6 test. :-) But this got me curious, so I grabbed a list of prefixes from [1] and decided to ping them all. Since I went through all that effort, might as well share the findings: $ for i in `cat list.txt`; do fping -6 $i -t 500 -r 0; done | grep 'is alive' 2409:: is alive 2a09:: is alive 2a11:: is alive 2a12:: is alive [<- 2a14:7:ffff::2]2a14:: is alive [1] https://www.iana.org/assignments/ipv6-unicast-address-assignments/ipv6-unica... Tomas
6. 4. 2024 v 12:00, Ben Cartwright-Cox via NANOG <nanog@nanog.org>:
It appears that 2600:: no longer responds to ICMP.
$ mtr -rwc 1 2600:: Start: 2024-04-06T10:53:41+0100 HOST: metropolis Loss% 1.|-- lcy02.flat.b621.net 0.0% [...] 6.|-- ldn-b4-link.ip.twelve99.net 0.0% 7.|-- ldn-bb1-v6.ip.twelve99.net 0.0% 8.|-- nyk-bb2-v6.ip.twelve99.net 0.0% 9.|-- ??? 100.0 10.|-- sprint-ic301620-nyk-b5.ip.twelve99-cust.net 0.0% 11.|-- ??? 100.0
This seems to have happened around Friday 5th 13:40 UTC.
2600::, a IP address owned by the Sprint network (Now since acquired by Cogent Communications) is a common (at least in my circles) IPv6 testing address, in a similar way that 8.8.8.8 or 1.1.1.1 is for a quick address to remember that always pings, when such a address is so easy to remember, you sometimes cannot help it becoming a "core project" :) ( https://xkcd.com/1361/ )
2600:: is also used to be the address of sprint.net, now sprint.net has no v6.
This is sad, and I would either propose that Cogent/Sprint (I assume 2600:: is under the ownership of Cogent now) revive this address as it's a very helpful testing address that is burned into the minds of many. Or at the very least, I'm more than willing to tank the effort of responding to ICMP!