generated: '2026-08-28'
method: probed
source: >-
  Live DNS/TLS/HTTP probes (probe-domain-security.py plus dig/openssl probes of the additional
  trysparrow.com hosts named in the app.trysparrow.com Content-Security-Policy).
note: >-
  Sparrow runs two domains. trysparrow.com is the original operating domain and still carries the
  application, the API backend, sign-in, support and status; sparrow.com is the newer marketing
  domain. The security posture differs sharply between them: trysparrow.com is DNSSEC-signed and has
  both SPF and a DMARC policy at p=quarantine, while sparrow.com has no SPF, no DMARC and no DNSKEY.
  Neither domain publishes a CAA record. HSTS is enforced on app.trysparrow.com
  (max-age=63072000; includeSubDomains) but explicitly disabled on app.sparrow.com (max-age=0).
hosts:
- host: sparrow.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 23 08:29:29 2026 GMT
  hsts: null
- host: trysparrow.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 11 13:11:48 2026 GMT
  hsts: null
  note: 301 redirect host
- host: app.sparrow.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 23 08:29:29 2026 GMT
  hsts: 'max-age=0'
  note: HSTS header present but max-age is zero, which disables it.
- host: app.trysparrow.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 11 13:11:48 2026 GMT
  hsts: 'max-age=63072000; includeSubDomains'
  x_frame_options: deny
  csp: true
  csp_note: >-
    A strict Content-Security-Policy with default-src 'none' is served. It is also the artifact that
    revealed Sparrow's own origins — api.trysparrow.com, login.trysparrow.com, support.trysparrow.com
    and uploads.trysparrow.com.
domains:
- domain: sparrow.com
  dnssec: false
  caa: []
  spf: false
  dmarc: false
- domain: trysparrow.com
  dnssec: true
  dnskey: present
  caa: []
  spf: true
  spf_record: >-
    v=spf1 include:_spf.google.com include:emsd1.com include:u12511619.wl120.sendgrid.net
    include:mail.zendesk.com include:39814015.spf07.hubspotemail.net ~all
  dmarc: true
  dmarc_policy: quarantine
  dmarc_record: 'v=DMARC1; p=quarantine; adkim=r; aspf=r; rua=mailto:REDACTED@trysparrow.com'
  mx: google