CoStar Group · Domain Security

Costar Domain Security

Domain security

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

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Transport & Host Security

www.costargroup.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Nov 6 23:59:59 2026 GMT
www.costar.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Nov 6 23:59:59 2026 GMT
www.loopnet.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Nov 4 23:59:59 2026 GMT

Domain (DNS/Email) Security

costargroup.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: none
costar.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: yes

Source

Domain Security

costar-domain-security.yml Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.costargroup.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Nov  6 23:59:59 2026 GMT
  hsts: null
- host: www.costar.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Nov  6 23:59:59 2026 GMT
  hsts: null
- host: www.loopnet.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Nov  4 23:59:59 2026 GMT
  hsts: null
domains:
- domain: costargroup.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: reject
- domain: costar.com
  dnssec: false
  caa:
  - 0 issue "letsencrypt.org"
  - 0 issue "digicert.com"
  - 0 issue "amazon.com"
  - 0 issue "godaddy.com"
  spf: true
  dmarc: true
  dmarc_policy: reject