The address websites see
When you open a site, your connection presents a public IP address. That is how the reply finds its way back. You can read yours on the what is my IP address page.
IP address and IP location
The number and the place are different. IP location is the city and region registered to that network. It is usually a metro area, not a house. The IP address location page puts that area on a map.
Why the number changes
A new Wi-Fi network, mobile data, or a VPN can present a different IP address. The VPN check page explains what that means for the address other sites see.