Google Site Operator

We can see everything Google has indexed under a domain via a Google site: search using the Google site: operator with this format:

site:https://www.marcuslemonis.com/

This lists everything Google has indexed for the www version of the domain, want a more detailed picture, remove www.:

site:https://marcuslemonis.com/

This will show webpages indexed on sub-domains as well, looks like all the content for marcuslemonis.com is under the www version.

I own the classic-literature.co.uk domain and some of the content is shared over multiple sub-domains, see the Google site: search for an example:

site:https://classic-literature.co.uk/