Article views based on users ip

First of all, sorry for another subject about ipv4 and ipv6. I'm still confused at some points. Let me explain.

I want to store the number of views for my articles.

To do this in a best method I need also to store the users ip in a table.

Table article_views_ip_list with columns ip varbinary(16) and ip_id int(11) UNSIGNED AUTO_INCREMENT

Table article_views with columns article_id, ip_id (from article_views_ip_list). Here I will set uniqeu for both.

Get article views

SELECT COUNT(*) FROM article_views WHERE article_id = 123

Sounds good until here.

So, in my application I will check if IPv6 exists. If yes, it will be inserted into ip varbinary(16) (from article_views_ip_list).

If the IPv6 doesn't exists or is not correct, I will insert the IPv4 in the same column ip varbinary(16) (from article_views_ip_list).

I go to https://whatismyipaddress.com/ and the website gives to me:

IPv6: 2a02:2f0b:430e:1500:61ce:b1da:4a58:975

IPv4: 82.76.115.143

So, I have both available...

If I insert IPv6 into article_views_ip_list, and tomorrow (is that possible ?) I don't have anymore IPv6, then I will insert the IPv4.

So, I will have 2 ips from same user and further, SELECT COUNT(*) FROM article_views WHERE article_id = 123 will return to me more views than expected. I could say duplicates.

Can someone please clarify ?