host.tools

Security headers grader

HTTP /api/v1/http/security-headers

A+ to F grade for HSTS, CSP, X-Frame-Options, COOP, Referrer-Policy and more.

Try: https://host.com https://checkhost.com https://hostinfo.com https://crypt.tools
Related: DNS lookup (dig) DNS propagation Domain WHOIS SSL certificate inspector HTTP headers Security headers grader MX lookup SPF tester DMARC tester
A
86% — A
URL: https://accounts.google.com/v3/signin/identifier?opparams=%253Fcred_ref%253Dtrue%2526hd%253Dgoogle.com&dsh=S-2145180519%3A1778320385310153&client_id=761377308534.apps.googleusercontent.com&hd=google.com&o2v=1&redirect_uri=https%3A%2F%2Flogin.corp.google.com%2Foauth&response_type=code&scope=openid+email&service=lso&state=s%3Dm.gutsdev.corp.google.com%3A443%2Fuberproxy%2F%26c%3D1%26d%3Dhttps%3A%2F%2Fm.gutsdev.corp.google.com%2F%3Fupxsrf%253DAM2vRLmFe3LayH8pBv4W_5RO5h3xVY08e2Bxy8McSDGCdo-5Ag%3A1778320385214%26keyIds%3D588916238%2C1331854303%2C-337386367%2C788849210%2C-1430978537%2C1163017845%2C-100563820%2C2023603197%26maxAge%3D1200%26authLevel%3D1500%26ssoformat%3DCORP_SSO%26x%3DABKNxowEes_vSS6Fhbw0lieZ0_PaTHYVl2-y5B1tsM-kiBbiuA%3A1778320385276&flowName=GeneralOAuthLite&continue=https%3A%2F%2Faccounts.google.com%2Fsignin%2Foauth%2Flegacy%2Fconsent%3Fauthuser%3Dunknown%26part%3DAJi8hAOcku6AOXzjxFcN8qMjFOizRq-gQZjtu_iNYgsfsYE13yWtGl65qZiAkUX1WF1ffYRoPmNp4CM-K8MewHMjJkNTgIcD9OO1FGXOuGHxgXFZSPrFsv1HjStrLxQSywI7bxhjBSJOVF1OByIRT6rrXMQIUVdsYcXoHr9iI1d-klkB7rOL-17KolCS2fOzSwvb-Jsiw4J3PYi_HEQ7_v2AXiCAsm76MM72BubA3B1OZOWrxaz0IkijoizpWkGTklgCny_yEtkMus5Ixnskqv2qAvDEHsT99pE8Pim5ThQJQ7-kHlukKM-uef40e3YlupGMe3MZnIKFc0j62m-6oIRaF-rIBb8YiSWqqysIeq5xCwUqH5G3UIjhHYqO0UhVS0AAXWavP83OqqW_mrbl7674DJULxE9rqPDoXMwfHaYsAF5rX0gazGk%26flowName%3DGeneralOAuthFlow%26as%3DS-2145180519%253A1778320385310153%26client_id%3D761377308534.apps.googleusercontent.com%23&app_domain=https%3A%2F%2Flogin.corp.google.com&rart=ANgoxcfPkIIENzr22GwV-qN8MvOLJu1wPb_hdFXLHadufwGFRQNpMcY5PsPVSJMvfAtkjFAGWKDNVHfcbukJch_EjDNFGHSxkWTm6wNApbKUuajFXiz1BWc
Status 200 · 10 checks
Strict-Transport-Security
max-age=31536000; includeSubDomains
+20
Content-Security-Policy
present
+25
X-Content-Type-Options
should be `nosniff`
+10
X-Frame-Options / frame-ancestors
prevents clickjacking
+10
Referrer-Policy
controls Referer leakage
+8
Permissions-Policy
restricts powerful features
+8
Cross-Origin-Opener-Policy
COOP isolates browsing context
+6
Cross-Origin-Resource-Policy
CORP blocks cross-origin reads
+6
Server header masked
don't leak version
+4
X-Powered-By absent
don't advertise stack
+3
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How to use Security headers grader
  1. 1
    Paste your input

    Enter the value at the top — domain, IP, URL, email, ASN, hash, whatever fits this tool. The smart input auto-detects type.

  2. 2
    Click "Inspect"

    host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.

  3. 3
    Open the API tab

    Every web tool has a sibling /api/v1/http/security-headers JSON endpoint with the same payload. One copy-as-curl click and you're scripting it.

Why this matters

Headers are how the modern web declares its security posture. Auditing them is the highest-ROI thing you can do this week.

API equivalent
/api/v1/http/security-headers?q=m.gutsdev.corp.google.com 
curl -s '/api/v1/http/security-headers?q=m.gutsdev.corp.google.com'
Embed this tool
<iframe src="/http/security-headers?q={INPUT}&embed=1"
  width="100%" height="600" frameborder="0"></iframe>

Drop into any HTML page. The embed=1 flag hides nav and footer.

FAQ · Security headers grader

Common questions

Is Security headers grader free?
Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/http/security-headers is free up to 100 requests/hour, no key required.
Where does the data come from?
Real-time probes against authoritative sources (DNS root, RIRs, registries, the target server itself), plus partner data feeds from hostinfo.com (GeoIP/ASN) and hostcheck.com (reputation).
How fresh are the results?
Live by default. Cached for 5 minutes to make repeat queries instant; pass ?nocache=1 for a forced refresh.
Can I run this from the command line?
Yes — every tool ships with a copy-as-curl. There's also an official CLI: host.tools http security-headers YOUR_INPUT.
Can I monitor results over time?
Pro tier lets you schedule any tool to run every 1/5/15/60 min and alert on diff. See monitors.
host.tools Pro

Run Security headers grader on a schedule. Get pinged when it changes.

Pro gets you bulk lookups, monitors, webhook alerts, history, exports and 10,000 API calls/day. $19/mo.

See pricing Tour monitors
  • ✓Schedule any tool — every 1, 5, 15, 60 min
  • ✓Diff against last run, alert on change
  • ✓Webhook + email + Slack + PagerDuty + OpsGenie
  • ✓Bulk CSV upload, 1,000 inputs per job
  • ✓Export results as CSV / NDJSON / Excel
  • ✓90-day history, comparison view