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[`Skopeo`](https://github.com/containers/skopeo) is a tool for managing remote containers.

It has a [`list-tags`](https://github.com/containers/skopeo/blob/main/docs/skopeo-list-tags.1.md) subcommand which does exactly what it sounds like:

```shell
$ skopeo list-tags docker://docker.io/archlinux
```

Conventional container registries use the `docker` protocol, and this needs to be specified in the URL.

Note containers may have a ton of tags, so you might want to pipe the output to `less` or do some filtering. Some decent tips can be found in [this blog post](https://medium.com/@smathew.35/list-tags-of-a-docker-image-with-skopeo-e34ed3fd8e54).