WAN (Public) or LAN (Private) Address?
You have two two addresses to consider:
- WAN (Public) - as seen by the outside world when accessing your network. This address is assigned to you by your ISP [link], this is the address accessed via SDRSpace.com.
- LAN (Private) - this is your internal address [link].
When you access a server locally you can always use the server's LAN address - the address on your local network - typically in the 192.168.x.x range. You may be able to access using the WAN (public) address, this all depends on your router. Newer, better routers usually support access to the LAN via the WAN address.
Static WAN Address
If you are making your server available to computers outside your network (access over the internet) then a static WAN (static IP) address is very highly recommended.
Normally your ISP will assign you a public IP address, you see this in your router settings; an example from an ASUS RT-AC3200 is shown below. To avoid the address changing you should have a static IP address. Most ISPs allow you to purchase a static IP address (keeping the same IP address) for a small fee, for example £5 one-off from plusnet in the UK.
Open a Command Prompt window, type the command ipconfig and press Enter. This command lists all the network adapters (both Ethernet and wireless) found on your Windows computer, and it shows details about each of them. For each network adapter, you see both the IPv4 address and the IPv6 Address.
Enter the command ipconfig /? for a list of all options.