it Can Change, your getting a Dynamic WAN IP Address, but just because you were assigned the same one for a long time do not get comfortable with it, it can and has changed, what you need is a Dyn DNS. basically you need a static hostname that the IP address will change and re-direct to what ever your current IP becomes. DynDNS is the name of the service but theres lots of providers out there who offer such service, i had one back in the day, most modems support the config ,otherwise a quick script on your laptop or desktop will update the Hostname to your new IP.
This is what I do.
I used to use DYNDNS until they started charging 😞
I am using No-ip. Its basic service is free, but if your IP doesnt change within a month and isnt updated to something new, it will notify you that it will be removed unless renewed... I get an email, do the quick renewal.
I have a small webserver running at home. I have a registered domain, but I point that do the dynamic services address. Then just update it.
