Docker registry URL

Hi,
I am trying to pull docker images from nvcr.io without using docker pull.
The script can do the work: https://github.com/moby/moby/blob/master/contrib/download-frozen-image-v2.sh

but it needs urls for the ncvr.io

registryBase='https://registry-1.docker.io
authBase='https://auth.docker.io
authService='registry.docker.io

Can anyone please help with the similar values for nvcr.io