# A-Trust-Root-09 root certificate (A-Trust)

> A-Trust-Root-09 is a root CA certificate operated by A-Trust (RSA 4096, valid until 2036-07-14, SHA-256 7A38F708). As of the latest CCADB data it is trusted for TLS server authentication by 1 of 4 major root stores: Microsoft.

Source: https://ssl.sh/roots/a-trust-root-09/
Last updated: 2026-11-10

A-Trust-Root-09 is a root CA certificate operated by A-Trust (RSA 4096, valid until 2036-07-14, SHA-256 7A38F708). As of the latest CCADB data it is trusted for TLS server authentication by 1 of 4 major root stores: Microsoft.

| Field | Value |
|---|---|
| CA owner | A-Trust |
| Subject | CN=A-Trust-Root-09,OU=A-Trust-Root-09,O=A-Trust GmbH,C=AT |
| SHA-256 | 7A38F708A35A31E42E1CF3220F9A2D273E7666354618B2464657D43D8E77ADC2 |
| SPKI SHA-256 | 69A693DC4D6C24EBBB82362E62DD887F519E254722B5614EEB651A54914CD7B4 |
| Valid from | 2023-02-21 |
| Expires | 2036-07-14 |
| Key | RSA 4096 |
| Signature algorithm | sha256WithRSAEncryption |
| Serial number | 769DB9D5 |
| SHA-1 (Windows thumbprint) | D05849DE4004DA6E867DEE000671CDA8F423266F |

## Root store status

| Root store | Status | Trusted for TLS | Distrust for TLS after | Details |
|---|---|---|---|---|
| Chrome | Not included | No | - | - |
| Mozilla | Not included | No | - | - |
| Apple | Not included | No | - | - |
| Microsoft | Included | Yes | - | Trusted EKUs: Server Authentication, Client Authentication |

The CCADB lists no EV policy OID for A-Trust-Root-09.

## Intermediate CAs issued by this root

The CCADB lists no intermediate CA certificate signed directly by A-Trust-Root-09.


## Cross-signed versions

No certificate in the CCADB has the same subject and public key as A-Trust-Root-09 with a different issuer, so a client has to carry A-Trust-Root-09 itself in its root store to trust it.


## What happens when it expires

A-Trust-Root-09 is valid until 2036-07-14, about 9.7 years after this data snapshot (2026-11-10). From that day, browsers and operating systems that check trust-anchor expiry stop accepting chains that end at this root, so any certificate that can only chain to it fails validation. Android is a known exception: it does not enforce the expiry date of trust anchors.

## FAQ

**Is A-Trust-Root-09 trusted by Chrome, Firefox, Safari and Windows?**

As of 2026-11-10, Microsoft trust it for TLS server authentication; Chrome, Mozilla, Apple do not.

**When does A-Trust-Root-09 expire?**

On 2036-07-14, about 9.7 years after the 2026-11-10 data snapshot.

**How many intermediate certificates has A-Trust-Root-09 issued?**

The CCADB lists no intermediate certificate signed directly by A-Trust-Root-09.

**Is A-Trust-Root-09 cross-signed?**

No. The CCADB has no certificate with the same subject and public key signed by another CA.

Sources: CCADB TLS Server Authentication report, All Included Root Certificate Trust Bit Settings, All Certificate Information (V5), the per-store TLS reports and Mozilla's Included CA Certificate Report (ccadb.org/resources).