HTTP/2 200 date: Thu, 16 Oct 2025 14:24:25 GMT content-type: text/plain; charset=utf-8 content-encoding: gzip content-security-policy: default-src 'self' 'unsafe-inline' data: https://datatracker.ietf.org/ https://www.ietf.org/ https://ietf.org/ https://analytics.ietf.org https://static.ietf.org; frame-ancestors 'self' ietf.org *.ietf.org meetecho.com *.meetecho.com cross-origin-opener-policy: unsafe-none etag: W/"4999f1d16390345b7d989c749e82dba8" referrer-policy: strict-origin-when-cross-origin strict-transport-security: max-age=3600; includeSubDomains vary: Cookie, Accept-Encoding x-content-type-options: nosniff x-frame-options: SAMEORIGIN cf-cache-status: MISS expires: Thu, 16 Oct 2025 18:24:25 GMT cache-control: public, max-age=14400 set-cookie: __cf_bm=pgoN6TSKWgC.ldyvMjxeDTGKhzgY962XqeClk4NnAxE-1760624665-1.0.1.1-0mLQM0TM2ErosB30p.BsKS6wpEFKZOmPci896FPUnhYhGUhcWgHYR0A5w86oWOHm1Lk0qPrrLEFwdjjB9.zFVVkgK_Hr08pT6J3MBdVku9o; path=/; expires=Thu, 16-Oct-25 14:54:25 GMT; domain=.ietf.org; HttpOnly; Secure; SameSite=None server: cloudflare cf-ray: 98f83839be0c860e-BLR alt-svc: h3=":443"; ma=86400 @misc{rfc9567, series = {Request for Comments}, number = 9567, howpublished = {RFC 9567}, publisher = {RFC Editor}, doi = {10.17487/RFC9567}, url = {https://www.rfc-editor.org/info/rfc9567}, author = {Roy Arends and Matt Larson}, title = {{DNS Error Reporting}}, pagetotal = 11, year = 2024, month = apr, abstract = {DNS error reporting is a lightweight reporting mechanism that provides the operator of an authoritative server with reports on DNS resource records that fail to resolve or validate. A domain owner or DNS hosting organization can use these reports to improve domain hosting. The reports are based on extended DNS errors as described in RFC 8914. When a domain name fails to resolve or validate due to a misconfiguration or an attack, the operator of the authoritative server may be unaware of this. To mitigate this lack of feedback, this document describes a method for a validating resolver to automatically signal an error to a monitoring agent specified by the authoritative server. The error is encoded in the QNAME; thus, the very act of sending the query is to report the error.}, }