Lee Howard wrote: ...
There is obviously a long tail of ip4 destinations, but nearly all of 500 of the Alexa global 500 have ip6 listeners,
Do you have a data source for that? I see no indication of IPv6 listeners on 85% of the top sites.
A slightly different metric, 44% of USA content available on IPv6:
Right, weighted by DNS queries. Compare to http://www.vyncke.org/ipv6status/detailed.php?country=us and http://www.employees.org/~dwing/aaaa-stats/
Not equivalent to "nearly all of Alexa 500."
Using a derivative of Dan Wings code from a couple of years back I get: The top 5 websites: AAAA records and IPv6 connectivity count with A: 5 (100.000%) count with AAAA: 4 ( 80.000%) Of the 4 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 4 (100.000%) The top 10 websites: AAAA records and IPv6 connectivity count with A: 10 (100.000%) count with AAAA: 6 ( 60.000%) Of the 6 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 6 (100.000%) The top 25 websites: AAAA records and IPv6 connectivity count with A: 25 (100.000%) count with AAAA: 10 ( 40.000%) Of the 10 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 10 (100.000%) The top 50 websites: AAAA records and IPv6 connectivity count with A: 50 (100.000%) count with AAAA: 21 ( 42.000%) Of the 21 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 21 (100.000%) The top 100 websites: AAAA records and IPv6 connectivity count with A: 98 ( 98.000%) count with AAAA: 30 ( 30.000%) Of the 30 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 30 (100.000%) The top 250 websites: AAAA records and IPv6 connectivity count with A: 248 ( 99.200%) count with AAAA: 56 ( 22.400%) Of the 56 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 56 (100.000%) The top 500 websites: AAAA records and IPv6 connectivity count with A: 494 ( 98.800%) count with AAAA: 91 ( 18.200%) Of the 91 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 91 (100.000%) The top 1000 websites: AAAA records and IPv6 connectivity count with A: 990 ( 99.000%) count with AAAA: 132 ( 13.200%) Of the 132 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 132 (100.000%) The top 2500 websites: AAAA records and IPv6 connectivity count with A: 2479 ( 99.160%) count with AAAA: 216 ( 8.640%) Of the 216 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 214 ( 99.074%) The top 5000 websites: AAAA records and IPv6 connectivity count with A: 4959 ( 99.220%) count with AAAA: 354 ( 7.083%) Of the 354 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 347 ( 98.023%) The top 10000 websites: AAAA records and IPv6 connectivity count with A: 9918 ( 99.230%) count with AAAA: 600 ( 6.003%) Of the 600 hosts with AAAA records, testing connectivity to TCP/80: count with IPv6 ok: 575 ( 95.833%) Original code developed by dwing@employees.org. manual run by tony on arabian.tndh.net using ./IPv6-check . on Fri Nov 22 09:48:17 PST 2013 (elapsed: 00:08:33, t: 15). Top 10000 websites based on Alexa top-1m.csv.