SSL Certificate Checker

A robust, concurrent SSL certificate checker written in Go.

Usage

Command Line Options

docker run --rm -it guessi/ssl-certs-checker --help

Sample Output

docker run --rm -it guessi/ssl-certs-checker --domains "github.com"

+----------------+-------------+----------------+-------------------------------+-------------------------------+--------------------+------------------------------------------------+
| Host           | Common Name | DNS Names      | Not Before                    | Not After                     | PublicKeyAlgorithm | Issuer                                         |
+----------------+-------------+----------------+-------------------------------+-------------------------------+--------------------+------------------------------------------------+
| github.com:443 | github.com  | github.com     | 2025-02-05 00:00:00 +0000 UTC | 2026-02-05 23:59:59 +0000 UTC | ECDSA              | Sectigo ECC Domain Validation Secure Server CA |
|                |             | github.com |                               |                               |                    |                                                |
+----------------+-------------+----------------+-------------------------------+-------------------------------+--------------------+------------------------------------------------+

License

MIT LICENSE