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lencr.org -  Let&#39;s Encrypt
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<meta name="description" content="What’s lencr.org? lencr.org is a domain name owned by Let’s Encrypt. We use it to host data that is referenced inside the certificates we issue.
Why is my computer fetching this data? Is it malicious? No, the data on lencr.org is never malicious. When a device connects to lencr.org, it’s because client software on that device (like a web browser or an app) connected to another site, saw a Let’s Encrypt certificate, and is trying to verify that it’s valid. This is routine for many clients.
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<meta property="og:description" content="What’s lencr.org? lencr.org is a domain name owned by Let’s Encrypt. We use it to host data that is referenced inside the certificates we issue.
Why is my computer fetching this data? Is it malicious? No, the data on lencr.org is never malicious. When a device connects to lencr.org, it’s because client software on that device (like a web browser or an app) connected to another site, saw a Let’s Encrypt certificate, and is trying to verify that it’s valid. This is routine for many clients.
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<meta name="twitter:description" content="What’s lencr.org? lencr.org is a domain name owned by Let’s Encrypt. We use it to host data that is referenced inside the certificates we issue.
Why is my computer fetching this data? Is it malicious? No, the data on lencr.org is never malicious. When a device connects to lencr.org, it’s because client software on that device (like a web browser or an app) connected to another site, saw a Let’s Encrypt certificate, and is trying to verify that it’s valid. This is routine for many clients.
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      <h1 class="post-hero__title mb-0">lencr.org</h1>
      
      
        <div class="post-hero__last-updated text-xs text-gray-100">
          Last updated: July 31, 2025
          
          <br><a href="/docs">See all Documentation</a>
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    <div class="narrow-container mx-auto py-8 prose-content">
      <h1 id="what-s-lencr-org">What&rsquo;s <code>lencr.org</code>?</h1>
<p><code>lencr.org</code> is a domain name owned by Let&rsquo;s Encrypt. We use it to host data
that is referenced inside the certificates we issue.</p>
<h1 id="why-is-my-computer-fetching-this-data-is-it-malicious">Why is my computer fetching this data? Is it malicious?</h1>
<p>No, the data on <code>lencr.org</code> is never malicious. When a device connects to
<code>lencr.org</code>, it&rsquo;s because client software on that device (like a web browser or
an app) connected to another site, saw a Let&rsquo;s Encrypt certificate, and is
trying to verify that it&rsquo;s valid. This is routine for many clients.</p>
<p>We can&rsquo;t speak to whether the <em>other site</em> being connected to is malicious. If
you&rsquo;re investigating network activity that seems unusual, then you may want to
focus on the connection that started just before the connection to <code>lencr.org</code>.</p>
<p>The pattern of clients&rsquo; connections to <code>lencr.org</code> might look unusual or
intermittent. Clients might never retrieve this data; only retrieve subsets of
it; or &ldquo;cache&rdquo; some data for efficiency, so they&rsquo;ll only access it sometimes
(the first time they need it, and when the data may have expired).</p>
<h1 id="what-exactly-is-this-data-for">What exactly is this data for?</h1>
<p>When client software (like a web browser or an app) connects to a site, and that
site presents a certificate, the client should verify that the certificate is
authentic and valid. This data helps clients do that in several ways.</p>
<ul>
<li>
<p>Under <code>c.lencr.org</code>, we provide Certificate Revocation Lists (CRLs) listing
all the unexpired certificates that we issued and later revoked.</p>
</li>
<li>
<p>Under <code>i.lencr.org</code>, we provide copies of our intermediate &ldquo;issuer&rdquo;
certificates, which are either signed by one of our root certificates or
&ldquo;cross-signed&rdquo; by another Certificate Authority (CA). A client may use this
data to confirm the &ldquo;chain of trust&rdquo; from the end-entity certificate it&rsquo;s
verifying, via one or more intermediate steps, to a root CA certificate that it
recognizes and trusts.</p>
</li>
</ul>
<h1 id="why-lencr-org">Why &ldquo;<code>lencr.org</code>&rdquo;?</h1>
<p>We used to use longer URLs like <code>http://example.int-x3.letsencrypt.org/</code>. However,
when we issued our <a href='https://letsencrypt.org/2020/09/17/new-root-and-intermediates'>new root and intermediate certificates</a>, we wanted to
make them as small as possible. Every HTTPS connection on the web (billions per
day) has to send a copy of a certificate, so every byte matters. We chose
<code>lencr.org</code> because of its similarity with our name: <strong>L</strong>et&rsquo;s <strong>ENCR</strong>ypt. We
pronounce it much like the fictional region of <a href="https://wiki.lspace.org/Lancre">Lancre</a> in Terry Pratchett&rsquo;s
<em>Discworld</em> novels.</p>

      

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