host.tools

robots.txt parser

HTTP /api/v1/http/robots

Fetch and parse robots.txt — User-agent groups, Disallow/Allow, Sitemap, Crawl-delay.

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
https://ws.support.github.com/robots.txt 400 1440 bytes 0 User-agent groups
Raw robots.txt 
<html>
  <head>
    <meta content="origin" name="referrer">
    <title>Bad request &middot; GitHub</title>
    <meta name="viewport" content="width=device-width">
    <style type="text/css" media="screen">
      body {
        background-color: #f6f8fa;
        color: rgba(0, 0, 0, 0.5);
        font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol;
        font-size: 14px;
        line-height: 1.5;
      }
      .c { margin: 50px auto; max-width: 600px; text-align: center; padding: 0 24px; }
      a { text-decoration: none; }
      a:hover { text-decoration: underline; }
      h1 { color: #24292e; line-height: 60px; font-size: 48px; font-weight: 300; margin: 0px; }
      p { margin: 20px 0 40px; }
      #s { margin-top: 35px; }
      #s a {
        color: #666666;
        font-weight: 200;
        font-size: 14px;
        margin: 0 10px;
      }
    </style>
  </head>
  <body>
    <div class="c">
      <h1>Whoa there!</h1>
      <p>You have sent an invalid request. <br><br>
        Please do not send this request again.
      </p>
      <div id="s">
        <a href="https://support.github.com">Contact Support</a> &mdash;
        <a href="https://githubstatus.com">GitHub Status</a> &mdash;
        <a href="https://twitter.com/githubstatus">@githubstatus</a>
      </div>
    </div>
  </body>
</html>
How to use robots.txt parser
  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/robots 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/robots?q=https%3A%2F%2Fws.support.github.com 
curl -s '/api/v1/http/robots?q=https%3A%2F%2Fws.support.github.com'
Embed this tool
<iframe src="/http/robots?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 · robots.txt parser

Common questions

Is robots.txt parser free?
Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/http/robots 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 robots 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 robots.txt parser 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