Finding the IP address of my container host side

Probably a totally simple answer: I took my code and yml file from a Linux box and wanted to run it on my Mac. On the Linux box, I can connect with code running on the host using the loopback. That does not work on my Mac. I read that the Quick Start Terminal should tell what IP to use, but I don’t want be on legacy docker. Where do I find what IP address I should use host side?

My compose file fully specifies ports both host and container side.

Thanks,