# Mozilla TLS Observatory Certificate Explainer

Upload a certificate PEM or add a certificate "id" or "sha256" in the URL.
For example, this is Let's Encrypt ISRG Root X1.

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## Basic certificate information

version |
serial number |
subject |
issuer |
not before |
not after |
signature algorithm |
key size |
exponent |
curve |
sha1 hash |
sha256 hash |
spki sha256 |
subject spki sha256 |
hpkp pin-sha256 |
tls observatory id |

## Certificate extensions

## Subject Alternative Names

## Trust Stores

## Post a certificate

## Certificate Paths to Trusted Roots