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I know that a forum admin and moderator could trace ip address of a site member , but how exactly it is done?
For example in this situation : first off, i did the registration using my computer. Then i logged in using my friend’s .

Now the admin wanna trace my ip. Which ip he will able to find?

Best reply by a:

any IP you have used from any computer is saved

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How does a forum admin or mod trace ip addresses of site members?