generated: '2026-08-04'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.lark.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  8 16:19:14 2026 GMT
  hsts: false
- host: support.lark.com
  https: true
  cert_expires: Sep 18 23:40:45 2026 GMT
  hsts: true
  hsts_max_age: 31536000
  hsts_include_subdomains: true
  note: Zendesk-hosted help center
- host: enroll.lark.com
  https: true
  cert_expires: Dec  9 23:59:59 2026 GMT
  hsts: false
  note: member enrollment application (enroll.production.lark.com)
- host: larktechnologies.statuspage.io
  https: true
  cert_expires: Feb  3 23:59:59 2027 GMT
  hsts: true
  hsts_max_age: 259200
  note: Atlassian Statuspage; status.lark.com CNAMEs here but does not serve TLS
absent_hosts:
- api.lark.com
- developer.lark.com
- developers.lark.com
- docs.lark.com
- mcp.lark.com
- trust.lark.com
- dashboard.lark.com
- partners.lark.com
findings:
- id: no-hsts-on-www
  severity: low
  detail: www.lark.com serves no Strict-Transport-Security header.
- id: dmarc-not-reject
  severity: low
  detail: DMARC policy is p=quarantine rather than p=reject.
- id: no-dnssec
  severity: low
  detail: lark.com is not DNSSEC-signed.
- id: status-subdomain-tls-broken
  severity: low
  detail: >-
    status.lark.com CNAMEs to larktechnologies.statuspage.io but the TLS handshake
    fails (curl exit 000); the status page is only reachable at the statuspage.io
    hostname.
- id: caa-iodef-present
  severity: info
  detail: 'CAA iodef points at mailto:security@lark.com — matches the published disclosure contact.'
domains:
- domain: lark.com
  dnssec: false
  caa:
  - 0 issue "letsencrypt.org"
  - 0 issue "pki.goog"
  - 0 issue "pki.goog; cansignhttpexchanges=yes"
  - 0 issuewild "amazon.com"
  - 0 issuewild "letsencrypt.org"
  - 0 iodef "mailto:security@lark.com"
  spf: true
  dmarc: true
  dmarc_policy: quarantine