What Domain Names are used by W3C?
w3.org. The two most common uses you will see are “www.w3.org” and “lists.w3.org” (for our Mail archives). If the domain name is something else, it’s probably not related to W3C. If you find “w3.org” in the content of the page, that is likely just related to the fact that the page is HTML; see our FAQ question on spam.