Iterating over values ​​in a table?

Question

MySQL

Hello, the essence of the problem is that you need to implement a search for identical records in the users table, namely, the presence of matches in the column named ip. Simply put, before executing some kind of script, you need to make sure that the script is executed 1 time in the entire life of the site from 1 ip address. The whole thing is written in laravel. Help please... Thank you