The article discusses a new DNS record type, _for-sale, which allows domain owners to signal that their domain is available for purchase without taking the site down or parking it. This record is defined by RFC 10023 and can be used to advertise the availability of a domain to brokers and availability services. The record carries a mandatory version tag and at most one tag-value pair, and its presence does not obligate the domain owner to sell. The article also outlines the rules for implementing this record and common mistakes to avoid.