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If your ISP has assigned the dynamic IP then and only then it can be changed. If they have assigned static IP then you would fin d that in order to change the IP you may need to contact the customer care. This way you can easily change the IP of your machine.
In case of dynamic IP here are the instructions.
1. In this option you can simply reset your modem or router. And keep it off for more than 10 minutes. Then ISP will allocate different IP address.
2. In second option you can reset the settings on the modem or router. In such case it will automatically assign a new IP for your device.
3. Choose another device for home network. So that device assigns new IP for entire home network.
4. Use proxy or the Tor. That should also changes the IP address of the PC.
This applies to the modem or the router with the dynamic IP.