DNS Lookup
RFC 10023 DNS Validator
Inspect domains worldwide in real time for valid _for-sale TXT records and their compliance with the IETF standard.
RFC 10023 Validator
Inspect DNS For-Sale Status
Real-time DNS query and format validation according to RFC 10023 standards.
How does this check work?
Queries run directly from your browser to public anycast resolvers from Cloudflare and Google. The DoH client queries the TXT record at _for-sale.[domain] and validates the mandatory v=FORSALE1; tag, price (fval), contact URI (furi), and notes (ftxt).
Citation Reference for Publications & Media
RFC 10023 Editorial Board (2026). RFC 10023 DNS Live Validator & Inspector. rfc10023.de. Retrieved on September 25, 2026, from https://www.rfc10023.de/validator
Published: October 2026 · IETF Informational RFC