.example, .invalid, .local, .localhost, .onion, and .test are all "special use" domains. https://en.wikipedia.org/wiki/List_of_Internet_top-level_domains#Speci

.example, .invalid, .local, .localhost, .onion, and .test are all "special use" domains. https://en.wikipedia.org/wiki/List_of_Internet_top-level_domains#Special-Use_Domains https://en.wikipedia.org/wiki/List_of_Internet_top-level_dom... "ICANN/IANA has created some Special-Use domain names which are meant for special technical purposes. ICANN/IANA owns all of the Special-Use domain names."