I regularly pull up the Chrome network panel to see what requests are being made. You can easily filter on different types of requests ( CSS, JS, XHR, etc. ), along with a general filter form that supports several different fields ( method, scheme, status-code, etc. ).
Yesterday I needed to look for particular host names. Fortunately the filter field supports this with
domain:. But it does one better than that. If you type just
domain: it will give you a list of host names used in requests for that page, along with wildcard options.
Here is what that looks like when viewing www.google.com:
In my case that was even more useful that just filtering the requests by domain.