tessl.io · Domain Security

Tesslio Domain Security

Domain security

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

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Transport & Host Security

tessl.io
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 21 13:30:30 2026 GMT
api.tessl.io
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Sep 21 13:30:33 2026 GMT

Domain (DNS/Email) Security

tessl.io
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · CAA: yes

Source

Domain Security

Raw ↑ 
generated: '2026-07-21'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: tessl.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 21 13:30:30 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: api.tessl.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 21 13:30:33 2026 GMT
  hsts: null
domains:
- domain: tessl.io
  dnssec: false
  caa:
  - 0 issuewild "comodoca.com"
  - 0 issuewild "digicert.com; cansignhttpexchanges=yes"
  - 0 issuewild "letsencrypt.org"
  - 0 issuewild "pki.goog; cansignhttpexchanges=yes"
  - 0 issuewild "ssl.com"
  - 0 iodef "mailto:security@tessl.io"
  spf: true
  dmarc: true
  dmarc_policy: quarantine