RFC 8020: NXDOMAIN: There Really Is Nothing Underneath

This document states clearly that when a DNS resolver receives a response with a response code of NXDOMAIN, it means that the domain name which is thus denied…

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Outgoing relationships (10 related RFCs)

Updates, Normative reference — RFC 1034: Domain names - concepts and facilities
Updates, Normative reference — RFC 2308: Negative Caching of DNS Queries (DNS NCACHE)
Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 1035: Domain names - implementation and specification
Normative reference — RFC 2136: Dynamic Updates in the Domain Name System (DNS UPDATE)
Normative reference — RFC 4592: The Role of Wildcards in the Domain Name System
Normative reference — RFC 6604: xNAME RCODE and Status Bits Clarification
Informative reference — RFC 4035: Protocol Modifications for the DNS Security Extensions
Informative reference — RFC 7719: DNS Terminology
Informative reference — RFC 7816: DNS Query Name Minimisation to Improve Privacy

Incoming relationships (6 related RFCs)

Normatively referenced by — RFC 8932: Recommendations for DNS Privacy Service Operators
Informatively referenced by — RFC 9156: DNS Query Name Minimisation to Improve Privacy
Informatively referenced by — RFC 9567: DNS Error Reporting
Informatively referenced by — RFC 9091: Experimental Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Extension for Public Suffix Domains
Informatively referenced by — RFC 9824: Compact Denial of Existence in DNSSEC
Informatively referenced by — RFC 9989: Domain-Based Message Authentication, Reporting, and Conformance (DMARC)