For a given domain, e.g. yahoo.com you can google-search site:yahoo.com
; at the top of the results it says “About 141,000,000 results (0.41 seconds)”. This includes subdomains like www.yahoo.com
, and it.yahoo.com
.
Note also that some websites generate pages on the fly, so they might, in fact, have infinite “pages”. A given page will be calculated when asked for, and forgotten as soon as it is sent. Each can have a link to the next page. Since many websites compose their pages on the fly, there is no real difference (except that there are infinite pages, which you can’t find out unless you ask for them all).
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solved Sort domains by number of public web pages?