This is the reason for DHCP reservations. (no need to do this for your pc) . So lets assume your current network is 192.168.1.x and your hub is at 192.168.1.25 you are going to have your new router ALSO set to 192.168.1.1/24 (aka 255.255.255.0) and then set a reservation on that router for myhub 192.168.1.25 MAC: XX:xx:XX:Xx:XX:XX so that everytime the hub boots it will grab that particular IP address. (this goes for any other devices that you have interacting with hubitat that use IP)
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Ok I think I understand. The tech will set the subnet then assign the ending numbers to match the ending numbers on all my devices so that way they keep all the same addresses. Is this correct?
I asked tech support if they could assign the same IP to the hub that I have and they said no however they may not understand my question. If what I was saying above is correct I will bring this up to the install tech.
My ISP service providers app actually already will show me all the IP addresses and MAC addresses for my connected items.
No, he will change the router to the same ip as your existing router. YOU will have to do the DHCP entries...
You need to make a print out of this as you will need to manually enter them in the DHCP reservation table. The install tech can tell you how to do it. Basically you'll just got to your gateway i[ and log in then make the changes.
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Doesn't hurt to ask the tech if they will do it, though I've never seen install techs do stuff at that level, so I think Rick's right, you'll end up having to do it. But maybe you'll get lucky and have a nice tech. 
Thank you very much.
I really only have two or three things I am worried about keeping the same IP. The rest of them can change it won't be a big deal. I will certainly record these.
I will certainly ask but like Rick said if he can show me how I can take excellent notes and then finish the rest myself. Lol
Heck there are only two or three things I really want to keep the same IP address. The remainder can generate new it won't really make a difference.
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One more thing to make sure of is that the tech sets up the new Modem/Router up to use the same WiFi SSID (i.e. name) and WiFi Password as the existing system. This will allow all of your WiFi devices to simply reconnect without having to modify any of their WiFi settings. This can be a huge time saver!
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I never thought about this but this would be a huge help. I have several security cameras that can be a bit testy at times so this would be huge. Fingers crossed he will do that. Thank you so much.
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Good point!
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Particularly w/something like Ring cameras, if you have any, PITA to change to a new network. Ask me how I know... 
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Thank all of you guys for this valuable information. I will ask the tech what he can help with and what he can show me how to do. I have a very valuable list of things to talk with him about. I truly appreciate all your guys help.
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I was fortunate with the fiber install today. The tech installed the new modem (he actually called it something else) and was supposed to install a Nokia router. However I was talking to him about changing the new router name to my current SSID and password and the IP subnet and he suggested instead of using the new router that we use the just the router portion of my old DSL mode/router combo. He said that I actually had a really good piece of equipment for what they use. Who knows if that is correct. This kept all my current settings. Wifi name and password, wifi channel, wifi channel width, jumbo frames setting, and all my IP addresses. Everything is performing as it did except the Internet is MUCH faster. Now to keep this thread in the memory bank for the time this router dies and has to be replaced.
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There isn't anything is nice as a happy ending. Sounds like the dice came up perfect for you, congratulations.
And yes, document everything. That's my wife says if we don't have it written down somewhere it doesn't exist and never happened.
Make sure that he's not using the WAN port to connect your old router to the new one or you will be double NATing which will cause you issues.
He has the ONT as he called it which is my understanding is the new modem (no router capability) plugged into the WAN/LAN port on the old modem/router combo. There is only two places to input coming signal into the old unit which is this port and the DSL port.
Thank you. I went through and documented everything off the old setup that I could. IP's, MAC addresses, wifi channel, channel width, etc. since my zigbee network and everything works with no issue I wanted to keep as much consistent as I could. Now if I have to replace in the future I have all this information to try and keep everything happy. Lol.
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