Slack · Domain Security

Slack Domain Security

Domain security

Domain security posture for Slack, probed live across 3 host(s) and 2 registrable domain(s). 3 host(s) serve HTTPS (up to TLSv1.3); 1 advertise HSTS. Email/DNS controls: DNSSEC present, SPF present, DMARC present (p=reject).

BotsChatCollaborationMessagingProductivityT1Team Communication

Transport & Host Security

api.slack.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Sep 3 09:48:09 2026 GMT
docs.slack.dev
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Sep 8 23:21:02 2026 GMT
slack.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 3 09:48:09 2026 GMT

Domain (DNS/Email) Security

slack.com
DNSSEC: yes · SPF: yes · DMARC: yes (p=reject) · CAA: yes
slack.dev
DNSSEC: no · SPF: no · DMARC: no · CAA: none

Source

Domain Security

Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: api.slack.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  3 09:48:09 2026 GMT
  hsts: false
- host: docs.slack.dev
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  8 23:21:02 2026 GMT
  hsts: false
- host: slack.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  3 09:48:09 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: slack.com
  dnssec: true
  caa:
  - 0 iodef "mailto:hostmaster@slack-corp.com"
  - 0 issue "digicert.com; account=455b15ed272bed097725c6ea50e89921fc57379c5338a29305c05771df65fff1"
  - 0 issue "letsencrypt.org; accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1532134906"
  spf: true
  dmarc: true
  dmarc_policy: reject
- domain: slack.dev
  dnssec: false
  caa: []
  spf: false
  dmarc: false