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From RFC 2606: The ".localhost" TLD has traditionally been statically defined in host DNS implementations as having an A record pointing to the loop back
by bravetraveler 2y ago
From RFC 2606:
The ".localhost" TLD has traditionally been statically defined in
host DNS implementations as having an A record pointing to the
loop back IP address and is reserved for such use
The RFC 8375 suggestion (*.home.arpa) allows for more than a single host in the domain. If not in name/feeling, but the strictest readings [and adherence] too.