Also called _for-sale · RFC 10023 · _for-sale TXT record
For-sale DNS record, explained
The record sits at _for-sale.example.com, and the label works at any level outside .arpa. Its text must start with v=FORSALE1; and may add one tag: fcod for a processor-specific code, ftxt for short text, furi for an http(s), mailto or tel link, or fval for an indicative price as a currency code plus amount. Several records can coexist, and a TTL of one hour or less is recommended. The RFC is Informational, not a standard: the price is not binding, and the record creates no obligation to sell.
It needs no lander: you can mark a name for sale while it runs a live website, without changing nameservers. Treat it as an extra signal, not a sales channel; keep marketplace listings, expect any published email or phone number to be scraped, and delete the record when the name sells.
The RFC says the text is meant mainly for people to read, while the link and price tags are also machine-parsable, so tools can pick up sale status and an indicative price from DNS. It sets limits: software must ask before following a furi link and should not commit to a purchase on an advertised price without human verification.
Example. A seller keeps the live website running and adds a TXT record at _for-sale.example.com reading v=FORSALE1;furi=https://example.com/offer, so any tool that checks the DNS knows where to send offers.
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Education, not financial, legal or tax advice. Domain investing is speculative and most domain names never sell. Read the disclaimer.