Yes, external and public IP address would be the same thing, and internal or private IP adress is the one you have inside your firewall/router. So for example, if you have a BT homehub, it will give your machine an IP address like 192.168.1.65.
Yes, and then it would not be called 'internal', but just 'IP address'. The simplest case for home users - your modem is in bridge mode (or no modem at all), your router is configured properly (or no router at all) and your is ISP leasing unique Can I get the internal IP address if I have the external Mar 18, 2018 How to Find Your Local and External IP Address - YouTube Aug 22, 2011 Port Forwarding - Internal Host IP Address?
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Sep 21, 2018
Internal IP address - NAT addresses, Private IP, NATed Addy
An IP address, short for "Internet Protocol" address, is how individual computers on the internet are identified. Every Google search, or other internet-based activity, is sent out using your IP Internal and External IP for server - Server Support and Feb 20, 2014 Internal Address / external Address - shared Links