Slack SSL certificate status
Valid — 73 days until expiry(slack.com)
This page shows the Slack SSL certificate as served by slack.com, read from a live TLS handshake by an independent CertPost probe and rechecked hourly: expiry, issuer, hostname coverage, the full chain, and the negotiated protocol.
Last checked 2026-08-23 00:55 UTC. CertPost is not affiliated with Slack.
Certificate details
Hostnames this certificate covers
*.slack.com, slack.com
Certificate chain as served
Common questions
Is the Slack SSL certificate expired?
At the last check, the certificate slack.com serves was within its validity period. It expires on 2026-11-04, 73 days from that check.
When does the Slack SSL certificate expire?
The certificate slack.com is currently serving expires on 2026-11-04 (73 days from the last check). Large services rotate certificates long before that date.
Who issued the Slack SSL certificate?
The certificate was issued by YR1.
How is this checked?
A CertPost probe opens a real TLS connection to slack.com on port 443 and reads the certificate the server presents, the same way a browser does. The result is cached and refreshed hourly.
Slack rotates certificates without downtime. Your own domains are the ones that expire quietly — watch 3 free, no card.
Monitor your certificatesOr run a one-off check with the free SSL checker.