I don't collect or save any of this location information on this website. If you use the whois lookup which use whoisxmlapi.com might do. When it comes to geolocation provided the whois isn't very precise and will not in most cases give the address to your ISP. If you use the browser's location service and especially on a smartphone will very often be very precise especially if location service (GPS) on your smartphone is activated and I always advice everyone to use this location service with caution.
If you want to test it this website is the far safest website to test it as the location you will receive you are already sharing with the vendor of the smartphone.
However, I don't log anything other than standard Apache webserver logs which only provide your public IP-address.

This website use whoisxmlapi.com service to lookup the location of your IP-address when you click on the Geolocation tab. By accessing this part of this website whoisxmlapi.com's Terms of Service (TOS) will apply and can be read in full here: Terms of Service for Whois API Hosted Webservice.

To get a more accurate location of your location you can click on the "Show precise location" button. By doing this it will use the browser and or smartphone location service and you will share the location with the vendor of the browser and/or smartphone. This is equivalent to clicking "Allowed" when a website asks for your position when you visit e.g. a website of a restaurant chain and they will show you the nearest restaurant. The only difference is that I don't log any location data, but Google, Apple, Microsoft, etc. might do. In addition to click on the "Show location" button you must grant permission when prompt by the browser. This will only work in a secure context which means that the browser support https and provide an encrypted connection between the web server and the visitor's browser.

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