Per https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml https://www.iana.org/assignments/special-use-domain-names/sp... and

Per https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml https://www.iana.org/assignments/special-use-domain-names/sp... and https://www.rfc-editor.org/rfc/rfc6761.html https://www.rfc-editor.org/rfc/rfc6761.html .local. is only for mDNS, but as with any other name you can always misuse it (see .corp. .dev. etc.). I notice .alt. now exists.