# I.CA TLS Root CA/RSA 05/2022 root certificate (První certifikační autorita (I.CA))

> I.CA TLS Root CA/RSA 05/2022 is a root CA certificate operated by První certifikační autorita (I.CA) (RSA 4096, valid until 2047-05-03, SHA-256 F9A17A00). 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/ica-cz-i-ca-tls-root-ca-rsa-05-2022/
Last updated: 2026-11-10

I.CA TLS Root CA/RSA 05/2022 is a root CA certificate operated by První certifikační autorita (I.CA) (RSA 4096, valid until 2047-05-03, SHA-256 F9A17A00). 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 | První certifikační autorita (I.CA) |
| Subject | C=CZ,2.5.4.97=NTRCZ-26439395,O=První certifikační autorita\, a.s.,CN=I.CA TLS Root CA/RSA 05/2022 |
| SHA-256 | F9A17A00E5C294BA9614A715819AF57F3FD48CC413453FBB8A5FC7E97964E2BC |
| SPKI SHA-256 | CFE016B124E93C7BB4F1D8D01C2A209391D8EC3C310E6EABC14BDBF0F52C1F60 |
| Valid from | 2022-05-03 |
| Expires | 2047-05-03 |
| Key | RSA 4096 |
| Signature algorithm | sha512WithRSAEncryption |
| Serial number | 5F5E104 |
| SHA-1 (Windows thumbprint) | 83E5E5DE325414970B263011084456E5FAA13FFA |

## 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 I.CA TLS Root CA/RSA 05/2022.

## Intermediate CAs issued by this root

The CCADB lists 2 intermediate CA certificates signed directly by I.CA TLS Root CA/RSA 05/2022: 2 currently valid, 0 expired and 0 revoked (revoked includes those whose parent was revoked).

| Intermediate | Operated by | Expires | Status | SHA-256 |
|---|---|---|---|---|
| I.CA TLS EV CA/RSA 06/2022 | První certifikační autorita, a.s. | 2032-06-19 | Valid | B9EF51A5F69A974F8D290B0A75FB253B7339053002AECB6516A270EA88AEF4ED |
| I.CA TLS DV/OV CA/RSA 06/2022 | První certifikační autorita, a.s. | 2032-06-19 | Valid | 15448C743B75DCC18D782728037226B6F339AC288C1B8FECBA5892556E5879EE |

## Cross-signed versions

No certificate in the CCADB has the same subject and public key as I.CA TLS Root CA/RSA 05/2022 with a different issuer, so a client has to carry I.CA TLS Root CA/RSA 05/2022 itself in its root store to trust it.


## What happens when it expires

I.CA TLS Root CA/RSA 05/2022 is valid until 2047-05-03, about 20.5 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 I.CA TLS Root CA/RSA 05/2022 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 I.CA TLS Root CA/RSA 05/2022 expire?**

On 2047-05-03, about 20.5 years after the 2026-11-10 data snapshot.

**How many intermediate certificates has I.CA TLS Root CA/RSA 05/2022 issued?**

The CCADB lists 2: 2 valid, 0 expired and 0 revoked. The newest valid one is I.CA TLS EV CA/RSA 06/2022, valid until 2032-06-19.

**Is I.CA TLS Root CA/RSA 05/2022 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).