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Well your public IP does change...The  external IP/Public IP is the one through which one gets connected to the  internet and it is classified into static and dynamic where   static  IP does not tend  to change and the dynamic IP varies each time   the modem  is switched  ON and OFF.If you have a dynamic IP then there   are chances  every-time  you log on to the internet you are assigned a   new IP.The  duration to  the change in IP depends on your ISP.Also if you vary your type of internet connectionthe Ip changes.You can look for the change in IP through Ip-details.com and confirm it.