Hreflang validator

HTTP /api/v1/http/hreflang

Find every <link rel="alternate" hreflang="…"> on a page and validate it.

Try: https://host.com https://checkhost.com https://hostinfo.com https://crypt.tools

Related: HTTP headers Security headers grader Redirect chain tracer SSL certificate inspector robots.txt parser sitemap.xml inspector

Result

Raw JSON

API / curl

43 ms · live

{
    "url": "https://checkhost.com",
    "count": 0,
    "entries": [],
    "issues": [
        "Missing x-default \u2014 Google recommends one per cluster."
    ],
    "has_x_default": false
}

{
    "ok": true,
    "slug": "http/hreflang",
    "title": "Hreflang validator",
    "ms": 43,
    "data": {
        "url": "https://checkhost.com",
        "count": 0,
        "entries": [],
        "issues": [
            "Missing x-default \u2014 Google recommends one per cluster."
        ],
        "has_x_default": false
    },
    "source": "live",
    "meta": []
}

JSON endpoint

/api/v1/http/hreflang?q=https%3A%2F%2Fcheckhost.com

curl

curl -s '/api/v1/http/hreflang?q=https%3A%2F%2Fcheckhost.com'

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Bulk lookups · monitors · webhooks · 10,000 API calls/day

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How to use Hreflang validator

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/hreflang 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/hreflang?q=https%3A%2F%2Fcheckhost.com

curl -s '/api/v1/http/hreflang?q=https%3A%2F%2Fcheckhost.com'

Embed this tool

<iframe src="/http/hreflang?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 · Hreflang validator

Common questions

Is Hreflang validator free?

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