# CAs SHALL NOT issue Certificates containing Domain Names that end in an IP Reverse Zone Suffix. — TLS certificate and CA requirement effective dates (CA/Browser Forum, Chrome, Mozilla)

For CAs SHALL NOT issue Certificates containing Domain Names that end in an IP Reverse Zone Suffix., requirement is CAs SHALL NOT issue Certificates containing Domain Names that end in an IP Reverse Zone Suffix; effective date is 2026-03-15; baseline requirements section is 4.2.2; authority is CA/Browser Forum TLS Baseline Requirements; scope is all publicly-trusted CAs issuing TLS server certificates, recorded from its source on 2026-08-05.

- **Requirement:** CAs SHALL NOT issue Certificates containing Domain Names that end in an IP Reverse Zone Suffix. _(verified: appears in the quote below)_
- **Effective date:** 2026-03-15 _(verified: appears in the quote below)_
- **Baseline Requirements section:** 4.2.2 _(verified: appears in the quote below)_
- **Authority:** CA/Browser Forum TLS Baseline Requirements _(our reading, not quoted from the source)_
- **Scope:** all publicly-trusted CAs issuing TLS server certificates _(our reading, not quoted from the source)_

## What the source says

> 2026-03-15 | 4.2.2 | CAs SHALL NOT issue Certificates containing Domain Names that end in an IP Reverse Zone Suffix.

## Source

- https://cabforum.org/working-groups/server/baseline-requirements/requirements/

Last verified: 2026-08-05. Review by: 2026-11-03.
Part of [TLS certificate and CA requirement effective dates (CA/Browser Forum, Chrome, Mozilla)](https://referencesource.org/tls-certificate-requirement-effective-dates/).