RFC 10023 defines a _for-sale DNS leaf node name

Sources: primary, discussion
Summary: RFC 10023, dated July 2026, specifies a _for-sale leaf node name carrying TXT records, used to signal that a registered domain is available to buy. The convention requires no protocol change. It reached Hacker News on 2026-08-08.
Why it matters: Registrars and availability services can adopt the signal against zones that already exist, because it rides on TXT records under an underscored leaf name.