DMARCbis

DMARC version 2 draft specifications and upcoming changes.

2 articles

July 2026

The DMARCbis np tag meant to block non-existent subdomains, bypassed by a NOERROR response on a DNSSEC zone using compact denial

CaptainDNS · July 7, 2026

The DMARCbis np tag and its DNSSEC blind spot: what every admin must check

The np tag protects non-existent subdomains from spoofing, but on many DNSSEC zones it is quietly neutralized with no signal at all. Here is how to detect and fix it.

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DMARC
DMARCbis
DNSSEC

March 2026

DMARCbis complete guide diagram: DNS Tree Walk replacing the Public Suffix List, new psd, np and t tags, and reporting split across RFC 9989, 9990 and 9991

CaptainDNS · March 18, 2026

DMARCbis: the complete guide to understanding and migrating to the new DMARC standard

DMARCbis replaces RFC 7489, drops the PSL in favor of the DNS Tree Walk, adds three tags and splits reporting into three documents. This guide covers everything: how it works, migration, compliance.

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Security