Signal · Domain Security

Signal Domain Security

Domain security

Domain security posture for Signal, probed live across 2 host(s) and 1 registrable domain(s). 2 host(s) serve HTTPS (up to TLSv1.3); 0 advertise HSTS. Email/DNS controls: DNSSEC present, SPF present, DMARC present (p=quarantine).

EncryptionMessagingSecurityCryptographyOpen SourcePrivacy

Transport & Host Security

signal.org
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Oct 5 17:16:42 2026 GMT
chat.signal.org
HTTPS: yes · HSTS: no

Domain (DNS/Email) Security

signal.org
DNSSEC: yes · SPF: yes · DMARC: yes (p=quarantine) · 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: signal.org
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  5 17:16:42 2026 GMT
  hsts: false
- host: chat.signal.org
  https: true
  tls_cert_error: '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get
    local issuer certificate (_ssl.c:1082)'
  hsts: null
domains:
- domain: signal.org
  dnssec: true
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine