My 34 year old HP3000 is in my garage. Since I have residential provider, my IP address has a tendency to change with the weather. Like every neighborhood power failure or ISP update. To tie it down takes a business account.
In any case my machine runs a job (a.k.a. cron in linux but this ain’t linux) that runs at the top of the hour every hour, it makes sure my machine’s internet domain is tied to the current IP of my house.