Oct 13, 2014 · Some routers do not allow you to assign an IP address outside the DHCP range of the same. If this is your case, you need to check the second part of this guide "Section B: Configuring a Static IP Address on your PS4" and follow steps 2 through 4 to set an IP address outside the DHCP range.
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May 24, 2011 PS3™ | Internet Connection Settings (wireless connection) Depending on the network environment, additional settings for PPPoE, proxy server or IP address may be required. For details on these settings, refer to the information from your Internet service provider or the instructions supplied with the network device. 12. Save your settings. 13. Test the connection. How to Setup a Proxy Server for a PS3 | Our Pastimes
Your PS3 doesn't have a specific IP address. What you're thinking of is a MAC Address. I don't know of any way for someone who has your IP to remotely grab your PS3's mac address. The simple way is to call your ISP and ask them to give you a new IP.
The local IP address of your PS4 could be set up in two ways: it can be static or dynamic. A dynamic IP address changes each time you restart your console or router. If you made settings that rely on the IP address to stay the same (for example port forwarding ), they would no longer work because the IP address has changed.