I installed the atc-/docker-registry-web project that gives me UI and search for my private registry.
https://github.com/atc-/docker-registry-web
It is dockerised and you can just run it by
docker run -p 8080:8080 -e REG1=http://registry_host.name:5000/v1/ atcol/docker-registry-ui
and review contents by browsing to registry_ui_host.name:8080