# OATI webCARES Server Root CA root certificate (OATI)

> OATI webCARES Server Root CA is a root CA certificate operated by OATI (RSA 4096, valid until 2045-12-08, SHA-256 30F4E5DD). 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/oati-webcares-server-root-ca/
Last updated: 2026-11-10

OATI webCARES Server Root CA is a root CA certificate operated by OATI (RSA 4096, valid until 2045-12-08, SHA-256 30F4E5DD). 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 | OATI |
| Subject | CN=OATI webCARES Server Root CA,O=Open Access Technology International Inc,C=US |
| SHA-256 | 30F4E5DD679FDE8FD11EB6E0C531615C438B06EDD9F59CBAB49680AA2B6990D9 |
| SPKI SHA-256 | 9DE4650DC1B56452D868B27FBEA1596515CFEB79C15B54FB16D2A4A8C7836982 |
| Valid from | 2025-12-08 |
| Expires | 2045-12-08 |
| Key | RSA 4096 |
| Signature algorithm | sha512WithRSAEncryption |
| Serial number | 66539C052C681A97499298D88DEAFA44 |
| SHA-1 (Windows thumbprint) | 5B2907750936AA256E6D702E3AF86585450154E1 |

## 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 |

The CCADB lists no EV policy OID for OATI webCARES Server Root CA.

## Intermediate CAs issued by this root

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by OATI webCARES Server Root CA: 1 currently valid, 0 expired and 0 revoked (revoked includes those whose parent was revoked).

| Intermediate | Operated by | Expires | Status | SHA-256 |
|---|---|---|---|---|
| OATI webCARES Server Issuing CA 2026 | Open Access Technology International, Inc. (OATI) | 2031-12-08 | Valid | 22D2AD94987A8C3B5203AF949EF462A5B3BB8955D603DB27DB5D4A8163E083AF |

## Cross-signed versions

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


## What happens when it expires

OATI webCARES Server Root CA is valid until 2045-12-08, about 19.1 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 OATI webCARES Server Root CA 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 OATI webCARES Server Root CA expire?**

On 2045-12-08, about 19.1 years after the 2026-11-10 data snapshot.

**How many intermediate certificates has OATI webCARES Server Root CA issued?**

The CCADB lists 1: 1 valid, 0 expired and 0 revoked. The newest valid one is OATI webCARES Server Issuing CA 2026, valid until 2031-12-08.

**Is OATI webCARES Server Root CA 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).