HTTP headers

HTTP /api/v1/http/headers

Capture every response header, follow redirects, time each hop.

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

https://emails.github.com 200 1 hop 495 ms

Final response headers (13)

date	Sat, 31 Oct 2026 17:34:15 GMT
content-type	text/html;charset=UTF-8
x-request-id	ec2e18fe97211f13
cache-control	private, no-cache, no-store, max-age=0
referrer-policy	strict-origin
x-frame-options	SAMEORIGIN
x-content-type-options	nosniff
content-security-policy	default-src 'self'; img-src 'self';script-src 'self' 'sha256-J+Y4l+yfxXd4cYzH9LhXUSHSb7zZu2bgddfCumVZJMo=';object-src 'none';form-action 'none';frame-src 'none';style-src 'self' 'sha256-OU0LTytxyR8kjQ+DRjRCDKhUAKEeH7rb0D5nBWOzRlQ='
set-cookie	__cf_bm=.XGLRzuCRz.hWl6iqEozzRYjKiSVQDio2Th_lkbghvE-1793468055.4008179-1.0.1.1-jwTopkqlWmgGh9aQPHEA4x4F6f2miuK9TyIwX8dboFArI1z.xRaogbB89G_aXL.lZnhPJMqZQVFyr_jL2t3WogAF6qZpQvklOD7EGm7io.s9DDl8PLLTliYNDADl1h1Y; HttpOnly; SameSite=None; Secure; Path=/; Domain=emails.github.com; Expires=Sat, 31 Oct 2026 18:04:15 GMT
server	cloudflare
cf-cache-status	DYNAMIC
content-encoding	gzip
cf-ray	a53468d23e9c4914-AMS

Tech stack

Cloudflare

How to use HTTP headers

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

Click "Inspect"

host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.
3

Open the API tab

Every web tool has a sibling /api/v1/http/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/headers?q=emails.github.com

curl -s '/api/v1/http/headers?q=emails.github.com'

Embed this tool

<iframe src="/http/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 · HTTP headers

Common questions

Is HTTP headers free?

Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/http/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 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 HTTP headers 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