Zulip · Domain Security

Zulip Domain Security

Domain security

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

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Transport & Host Security

zulip.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Mar 5 23:59:59 2027 GMT
chat.zulip.org
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 6 11:32:09 2026 GMT

Domain (DNS/Email) Security

zulip.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: yes
zulip.org
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: yes

Source

Domain Security

Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: zulip.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Mar  5 23:59:59 2027 GMT
  hsts: true
  hsts_max_age: 31536000
- host: chat.zulip.org
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  6 11:32:09 2026 GMT
  hsts: true
  hsts_max_age: 15768000
domains:
- domain: zulip.com
  dnssec: false
  caa:
  - 0 issue "amazontrust.com"
  - 0 issue "letsencrypt.org"
  spf: true
  dmarc: true
  dmarc_policy: reject
- domain: zulip.org
  dnssec: false
  caa:
  - 0 issue "amazontrust.com"
  - 0 issue "letsencrypt.org"
  spf: true
  dmarc: true
  dmarc_policy: reject