RFC 10023 Reference & Guides
Everything you need to configure, inspect, and automate DNS for-sale indicators according to the official IETF Informational publication RFC 10023.
RFC 10023 Specification
Complete breakdown of IETF RFC 10023 (Informational, July 2026). ABNF grammar, tags (fval, furi, ftxt, fcod), limits, and conventions.
Ecosystem & Adoption
See the Ecosystem & Adoption tracker for a continuously maintained overview of services and tools supporting RFC 10023.
DNS Provider Guides & Matrix
Step-by-step instructions for Cloudflare, Hetzner, INWX, Netcup, STRATO, IONOS, AWS Route 53, and OVHcloud with underscore support status.
REST API Documentation
Integrate live RFC 10023 validation and DoH checks into your registrar, broker, or domain portfolio software via /api/v1/validate.
Legal & Tax Guidelines
German & EU legal frameworks: Imprint duty under § 5 DDG, price indications, contract conclusion, and tax aspects of domain sales.
Frequently Asked Questions (FAQ)
Detailed answers regarding DNSSEC, multi-record RRsets, costs, email spam protection, and registry adoption (e.g. SIDN .nl).
Verification Badge
Embed neutral verification badges linking directly to live DNS inspection for your domain landing pages.
IETF RFC 10023: The '_for-sale' Underscored and Globally Scoped DNS Node Name
Published in July 2026 by the Internet Engineering Steering Group (IESG) as an Informational RFC. Author: Marco Davids (SIDN Labs). ISSN: 2070-1721.