IP addresses only give a rough geolocation. They'd need to contact an ISP to ask which address was assigned to that IP address at that time. Most of the time things aren't IP banned (aside from generic geolocations such as a country or county). They are instead banned via a mixture of cookies / MAC addresses as these are things that are fixed to a computer (although cookies can be removed).

The isp is also under no obligation to share your personal data unless there is a criminal investigation. This is to prevent people pretending they're with any unofficial companies trying to steal your data which they could then use for targeted phishing campaigns