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What you are referring to is a static IP.
Just configure the IP of each PC directly vs using dhcp.
You have to set it in each computer.
Just pick a series of IPS and assign one to each computer.
If the computers are windows, it is under networking.
Assigning a "Static IP" address to a PC/device is *not* a function of the router box. The router box only gets involved in assigning "dynamic IP" addresses through a procedure called "DHCP".
Each PC/device has its own TCP/IP configuration utility, Windows, Linux, etc and they are all different. However, in those utilities you have a choice of "Dynamic IP" (DHCP) or "Static IP" for the setup. You will need to consult the documentation or help files for your specific computer.
Just a note, when you choose Static IP, there are some other parameters that you will be responsible for, like "Subnet Masks" and "Gateway" and "DNS" addresses. I suggest you write down the current settings on your PC/Device first.
Once you have that all set up and working, you can look into the port forwarding.
I see my and your replies overlapped by a few minutes. I see that you know how to do it for Windows.
Given that Android devices are generally meant to be "mobile", and therefore use any available WiFi (free or otherwise), I would be surprised that Android games would require a fixed IP address. Starbucks is unlikely to cooperate in allowing you to set up port forwarding.
I thought that Android games took advantage of "UPnP", a method for applications to dynamically request a port forward from the "router/gateway" to the dynamic IP address they've been assigned. It also allows for the game to request the "external IP" address (the non-192.168.etc address) of the router that makes it possible for the incoming request to get to the router and eventually forwarded. UPnP is the solution to requiring fixed IP addresses on WiFi / mobile networks.
I don't have an Android Phone but I do have a Samsung Android Tablet.
1) Go to "Settings", select WiFi
2) Select the current (home) WiFI, Press and Hold.
3) Get a Menu with "Modify Network Config" entry, select that
4) Get a Menu with the option to enter the WiFi password (with Save and Cancel buttons)
5) Scroll down a little and see the "Show Advanced Options" checkbox (under the "Show Password" checkbox)
6) Lots of options including "IP Settings" pulldown with DHCP and Static options.
At this point, you're on your own as I did not fiddle with these setting further.