I want to get machine id of client computer. Client will log in to my application with his/her login ID.
Now I want to keep track of which userID(login id) is used with which MAC address.
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Tricky. If your clients are connecting directly to the site and not going though any sort of NAT or proxy then you could do a lookup on it here is a pretty good article on getting the mac address.
You might consider using cookies to keep track of the users rather than recording the mac address since there are some situations where you won’t be able to get an accurate mac address.