# Certainly Root R1 root certificate (Certainly LLC)

> Certainly Root R1 is a root CA certificate operated by Certainly LLC (RSA 4096, valid until 2046-04-01, SHA-256 77B82CD8). As of the latest CCADB data it is trusted for TLS server authentication by 3 of 4 major root stores: Chrome, Mozilla, Apple.

Source: https://ssl.sh/roots/certainly-root-r1/
Last updated: 2026-11-10

Certainly Root R1 is a root CA certificate operated by Certainly LLC (RSA 4096, valid until 2046-04-01, SHA-256 77B82CD8). As of the latest CCADB data it is trusted for TLS server authentication by 3 of 4 major root stores: Chrome, Mozilla, Apple.

| Field | Value |
|---|---|
| CA owner | Certainly LLC |
| Subject | CN=Certainly Root R1,O=Certainly,C=US |
| SHA-256 | 77B82CD8644C4305F7ACC5CB156B45675004033D51C60C6202A8E0C33467D3A0 |
| SPKI SHA-256 | 3F93F3FCF79D225D213EEF6A4A3F5885CF84FE3D7A7A3C11553517688C0E2100 |
| Valid from | 2021-04-01 |
| Expires | 2046-04-01 |
| Key | RSA 4096 |
| Signature algorithm | sha256WithRSAEncryption |
| Serial number | 8E0FF94B907168653354F4D44439B7E0 |
| SHA-1 (Windows thumbprint) | A050EE0F2871F427B2126D6F509625BACC8642AF |

## Root store status

| Root store | Status | Trusted for TLS | Distrust for TLS after | Details |
|---|---|---|---|---|
| Chrome | Included | Yes | - | - |
| Mozilla | Included | Yes | - | Trust bits: Websites; EV policy OIDs: not EV-enabled; First included in: NSS 3.80 / Firefox 103; Inclusion bug: #1727941 |
| Apple | Included | Yes | - | Trust bits: serverAuth, clientAuth |
| Microsoft | Not included | No | - | - |

The CCADB lists no EV policy OID for Certainly Root R1.

## Intermediate CAs issued by this root

The CCADB lists 1 intermediate CA certificates signed directly by Certainly Root R1: 1 currently valid, 0 expired and 0 revoked (revoked includes those whose parent was revoked).

| Intermediate | Operated by | Expires | Status | SHA-256 |
|---|---|---|---|---|
| Certainly Intermediate R1 | Certainly LLC | 2031-04-01 | Valid | 575C09B07A001CA0EF6B3B1C5730BFAFEBC7AD9F56A009F1966C32F08E659713 |

## Cross-signed versions

No certificate in the CCADB has the same subject and public key as Certainly Root R1 with a different issuer, so a client has to carry Certainly Root R1 itself in its root store to trust it.


## What happens when it expires

Certainly Root R1 is valid until 2046-04-01, about 19.4 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 Certainly Root R1 trusted by Chrome, Firefox, Safari and Windows?**

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

**When does Certainly Root R1 expire?**

On 2046-04-01, about 19.4 years after the 2026-11-10 data snapshot.

**How many intermediate certificates has Certainly Root R1 issued?**

The CCADB lists 1: 1 valid, 0 expired and 0 revoked. The newest valid one is Certainly Intermediate R1, valid until 2031-04-01.

**Is Certainly Root R1 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).