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<!doctype html>
<html lang="">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Check DNS results from Unbound</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
max-width: 40em;
margin-left: auto;
margin-right: auto;
margin-top: 2em;
}
</style>
</head>
<body>
<h1>Unbound DNS checker</h1>
<p>
Use this server to make DNS queries against an Unbound instance and get
logs. The Unbound instance is configured very similarly to
<a href="https://letsencrypt.org">Let's
Encrypt's</a> production servers, and is started fresh for each query so
there are no caching effects. If you are having trouble diagnosing a
DNS problem reported by Let's Encrypt, this may help you debug it.
Common problems include: invalid DNSSEC records, failure to implement <a
href="https://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00">DNS 0x20
(mixed case)</a>, timeouts, and flaky servers.
</p>
<p>
Once you've made a query, you'll get a URL you can share. Note that URLs
are currently only persisted in memory, so they are likely to disappear
after a few hours or days when the server is restarted.
<a href="https://github.com/jsha/unboundtest">Source code on GitHub</a>.
View the <a href="/conf">Unbound config</a>.
</p>
<form action="/q">
<label for="type">Query type:</label>
<input type="radio" name="type" value="CAA" checked="checked">CAA</input>
<input type="radio" name="type" value="A">A</input>
<input type="radio" name="type" value="AAAA">AAAA</input>
<input type="radio" name="type" value="TXT">TXT</input>
<br/>
<label for="qname">Domain:</label>
<input type="text" name="qname"></input>
<button id=submit>Query</button>
</form>
<script type="text/javascript">
</script>
</body>
</html>