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:

chrome-network-filter-domain

In my case that was even more useful that just filtering the requests by domain.