Is there a good way to determine what % of users/topics/posts are from IPv6 users? I'd love to see that kind of statistic. 

Why?

On 5/11/2018 at 5:50 AM, bfarber said:

Why?

Because it would be interesting to me. 

https://www.google.com/intl/en/ipv6/statistics.html

Considering pretty much everyone uses google in some manner, this would be pretty accurate. 

You could probably query your database directly to capture this information. Something along the lines of

SELECT COUNT(*) FROM _table_ WHERE ip_address LIKE '%:%';
SELECT COUNT(*) FROM _table_ WHERE ip_address NOT LIKE '%:%';

 

IPv4:

Select count(*) from table where inet_aton(ip_address) IS NOT NULL

IPv6:

Select count(*) from table where inet_aton(ip_address) IS NULL