Website reputation report

letsencrypt.org

Last checked 2 days ago · Point-in-time assessment

● Evidence is limited

What is this website?

letsencrypt.org is currently classified in the Philanthropy category based on observed public pages. An About page was also found. Recurring page-metadata topics include let encrypt, encrypt is, is free automated.

No listed local patterns observedHomepage-only analysis is not a malware clearance. Read the scope and findings below.

79/100Safety Score
75%Evidence Confidence
Trust Radar evidence profile Eight evidence dimensions from zero to one hundred. Exact values surround the chart. Threat Intelligence55 Domain History91 Infrastructure95 Website Security95 Security Hygiene80 Transparency63 Reputation50 Operational Stability96
Trust RadarEight observed factors. Select one to inspect its evidence.

How to read this report

Safety Score evaluates observed signals. Evidence Confidence measures how complete, direct, fresh, and consistent those signals are.

No automated scan can guarantee that a website is safe.

Independent evidence brief

What we observed about letsencrypt.org

Updated Sep 29, 2026

The latest scan examined 8 public pages on letsencrypt.org. Website descriptions below come from the site itself. Registration, connection and threat findings were checked separately.

Purpose and visible content

On its About page, the site says: Let’s Encrypt is a free, automated, and open Certificate Authority (CA), run for the public’s benefit. It is a service provided by the Internet…

  • About Let's Encrypt - Let's EncryptLet’s Encrypt is a free, automated, and open Certificate Authority (CA), run for the public’s benefit. It is…
  • FAQ - Let's EncryptThis FAQ is divided into the following sections: General Questions Technical Questions General Questions What services does Let’s…
  • Blog - Let's EncryptLet's Encrypt is a free, automated, and open Certificate Authority brought to you by the nonprofit Internet Security…

Registrar and domain history

Registered on Jul 7, 2014. Registrar: Cloudflare, Inc..

Recorded expiry date: Jul 7, 2027. Registry data can change.

Connection and hosting evidence

The checked homepage returned HTTP 200.

A valid TLS certificate was observed, expiring Dec 3, 2026.

Threat checks and score context

External malware-provider coverage was unavailable. The report does not treat this missing check as a clean result.

Safety Score: 79/100. Evidence Confidence: 75%. These measure different things.

Public content profile

Pages reviewed on letsencrypt.org

8 of up to 10 pages

We sampled public pages from this website to understand its subject and contact paths. The titles and short descriptions below come from the website itself. They are not endorsements or independent safety findings.

Public page evidence

Topics and keywords observed on letsencrypt.org

4 phrases

These phrases were extracted locally from sampled public page metadata. They are observations, not search-volume or ranking estimates.

let encryptTitle, H1, Meta description8 sampled pages
encrypt isMeta description4 sampled pages
is free automatedMeta description3 sampled pages
open certificate authorityMeta description3 sampled pages

At a glance

Key findings

✓

Report is current

The displayed evidence comes from the published immutable scan.

i

Confidence is separate

Unavailable evidence is shown as missing and never counted as clean.

!

Verify before sensitive actions

Check the exact URL and context before payments, credentials, or downloads.

Fully explainable

Why this score?

Versioned weights
Threat IntelligenceWeight 25%
55/100

Threat providers were unavailable. The neutral uncertainty baseline is not a clean verdict.

Domain HistoryWeight 10%
91/100

Domain registration age and expiry were checked.

InfrastructureWeight 10%
95/100

Observed DNS records and network address were checked.

Website SecurityWeight 15%
95/100

Observed certificate validity and TLS protocol were checked.

Security HygieneWeight 15%
80/100

Observed security header values were checked for basic protective settings. Empty values, disabled HSTS and unrecognized values receive no credit. This is not a complete browser-policy validation.

TransparencyWeight 5%
63/100

Observed site metadata and About page were checked. Publisher-supplied details are not independently verified.

ReputationWeight 5%
50/100

Popularity is weak context, not proof of safety. Unranked sites use a neutral baseline.

Operational StabilityWeight 15%
96/100

Observed HTTP status and final connection scheme were checked.

Server-side analysis

Automated security checks

Local antivirus and phishing checks

ClamAV · homepage HTMLNo signature match in the sampled HTML
Engine version1.5.4
Signature database date (UTC)2026-09-29T06:26:15+00:00
HTML bytes submitted90,043
Phishing.Database · exact hostnameNot listed in this snapshot
Feed downloaded (UTC)2026-09-29T18:00:06+00:00
Hosts in local snapshot386,017

Sampled scripts and pages

Resource analysis incomplete

5 resources checked · 6 script links observed on the homepage. Partial resource coverage.

ClamAV inspects the fetched homepage HTML on our server. New scans also sample up to four linked scripts and two collected internal pages, with size and time limits. Scripts are not executed. Other downloads, private server files and logged-in pages remain outside this check. A signature match needs investigation and can be a false positive. No match is not a whole-site safety guarantee.

Exact hostname lookup uses a downloaded Phishing.Database snapshot. It does not send this domain to an external lookup API or mark sibling subdomains as harmful. Not listed does not mean safe. Snapshot age is download age, not proof that every entry was recently revalidated.

Homepage HTML only · Eight local rule families · local-security-v2

Checks use the fetched page and redirect chain. Scripts are not executed, forms are not submitted, and linked files are not downloaded. This is not a malware clearance.

Page resource inventory

Linked scripts6
Inline scripts2
Embedded frames1
External script hosts0

Counts describe the sampled HTML, not every resource loaded by the browser. External resources are common and are not automatically harmful.

No listed local patterns observed. The limited rule set cannot detect every threat or behavior.

External threat intelligence

Provider coverageNot checked

Local checks do not query external reputation databases. An unavailable check is never a clean result.

Registration

Domain information

Public RDAP observation
Canonical domainletsencrypt.org
RegistrarCloudflare, Inc.
RegisteredJul 7, 2014
Domain age12 years
ExpiresJul 7, 2027
Registry statusesclient delete prohibited · client transfer prohibited · client update prohibited
Report statePublished

Infrastructure

Network & hosting

Observed endpoint, not legal location
IP address2a05:d014:58f:6200::258
Autonomous systemUnavailable
Network organizationUnavailable
Observed countryUnavailable
CDNNot detected
Web application firewallNot detected

At a glance

Infrastructure summary

Observed during this scan

A compact view of the connection, DNS and security surface. These observations describe what the scanner could verify at scan time and do not prove ownership or ongoing availability.

HTTP response200 · https://letsencrypt.org/
Endpoint2a05:d014:58f:6200::258
NetworkUnavailable
CDN and WAFNot detected · Not detected
DNS surface27 records · 2 nameservers · 5 mail exchangers
Protection signals6 security headers · 2 technologies · DNSSEC unknown

Page telemetry

Observed page statistics

Safe metadata only

These counters describe the fetched response and sampled HTML. Script counts describe references in the markup, not a complete browser network log. Cookie counts cover observed response headers.

Response size90,043 bytes
HTTP check duration0 ms
Cookies observedUnavailable
Script resources6 · 0 external hosts
Frames and sampled checks1 frames · 5 resources checked

Encrypted transport

TLS certificate

Valid when observed
StatusValid when observed
ProtocolTLSv1.3
IssuercountryName=US, organizationName=Let's Encrypt, commonName=YE2
Valid fromSep 4, 2026
Valid untilDec 3, 2026
Certificate namescp.letsencrypt.org · cp.root-x1.letsencrypt.org · cps.letsencrypt.org · cps.root-x1.letsencrypt.org · lencr.org · letsencrypt.com · letsencrypt.org · www.lencr.org · www.letsencrypt.com · www.letsencrypt.org

Resolution

DNS footprint

DNSKEY status unknown

DNSKEY presence does not verify the DNSSEC signature chain. Missing records can mean no record was returned or the lookup was unavailable.

A35.157.26.135TTL —
A63.176.8.218TTL —
AAAA2a05:d014:58f:6200::258TTL —
AAAA2a05:d014:58f:6200::259TTL —
NSowen.ns.cloudflare.comTTL —
NSvera.ns.cloudflare.comTTL —
MX1 aspmx.l.google.comTTL —
MX10 aspmx2.googlemail.comTTL —
MX10 aspmx3.googlemail.comTTL —
MX5 alt1.aspmx.l.google.comTTL —
MX5 alt2.aspmx.l.google.comTTL —
CAA0 issue "amazon.com"TTL —
CAA0 issue "letsencrypt.org"TTL —
CAA0 issue "pki.goog"TTL —
CAA0 issue "sectigo.com"TTL —
CAA0 issue "ssl.com"TTL —
CAA0 issue "www.digicert.com"TTL —
CAA0 issuewild "amazon.com"TTL —
CAA0 issuewild "letsencrypt.org"TTL —
CAA0 issuewild "pki.goog"TTL —
CAA0 issuewild "sectigo.com"TTL —
CAA0 issuewild "ssl.com"TTL —
CAA0 issuewild "www.digicert.com"TTL —
TXTanthropic-domain-verification-eer9ky=uy5e3EOy8j15k1u9UesevyP1NTTL —
TXTpardot1011011=d160caff32c4415bb46bb82d8c50e5bea7ea1a74f5a149cb96bd952467266044TTL —
TXTsending_domain1011011=f98c68e7636a708a1987c7b9da300d64a354041fa41ea2039fbb02bc18c4ed0fTTL —
TXTv=spf1 include:_spf.google.com ip4:23.178.112.0/24 ip4:66.133.109.36 ip4:64.78.152.132 include:mail.zendesk.com include:_spf.intacct.com -allTTL —

DNS observations · no external lookup API

Domain email protection

Exact-host SPF and DMARC observations help the owner investigate email impersonation risks. They are separate from website malware checks and do not change the Safety Score.

SPFPolicy record observed, not fully validated
DMARCPolicy record observed, not fully validated

What to do next

Review the records with your mail administrator. Inventory legitimate senders and test SPF and DKIM alignment before enforcing a stricter DMARC policy. Fix duplicate records and investigate overly permissive SPF rules.

This bounded check does not send email, probe SMTP, evaluate recursive SPF includes, verify DKIM signatures or apply organizational-domain DMARC inheritance. A missing subdomain record does not prove that no inherited protection exists. A DNS timeout is unknown, not an absent record. A policy record is not proof that messages authenticate successfully.

Responsible disclosure

security.txt

RFC 9116 observation
StatusPublished and readable
Security contacts1
Policy linkNot observed
ExpiryMissing or expired

This is a public vulnerability-reporting contact file. Its presence does not prove that the website is safe and does not change the independent Safety Score.

Browser protections

Security headers

6 observed
content-security-policypresent default-src 'none'; font-src 'self' https://doublethedonation.com https://rsms.me http://rsms.me ; style-src 'self' 'unsafe-inline' https://donorbox.org https://doublethedonation.com https://rsms.me http://rsms.me ; script-src 'unsafe-eval' 'unsafe-inline' 'self' data: https://www.google-analytics.com https://www.googleadservices.com https://www.googletagmanager.com https://cdn.jsdelivr.net http://cdn.jsdelivr.net https://googleads.g.doubleclick.net https://donorbox.org https://doublethedonation.com https://js.stripe.com https://jspm.dev https://js.stripe.com/v3/ https://sdks.shopifycdn.com https://www.paypal.com https://www.paypalobjects.com https://widget.thegivingblock.com https://*.shift4.com ; img-src 'self' data: blob: https://www.google-analytics.com https://donorbox.org https://doublethedonation.com https://*.paypal.com https://www.paypalobjects.com https://ak2s.abmr.net https://ak1s.abmr.net https://www.google.com https://cdn.shopify.com https://v.shopify.com ; frame-src https://donorbox.org https://www.youtube.com https://www.youtube-nocookie.com https://bid.g.doubleclick.net https://js.stripe.com/v3/ https://js.stripe.com/v2/ https://www.paypal.com https://outreach.abetterinternet.org https://app.netlify.com https://widget.thegivingblock.com/ ; connect-src 'self' https://d1dfn7jg27m4cf.cloudfront.net/ https://donorbox.org https://doublethedonation.com https://letsencrypt-merch.myshopify.com https://monorail-edge.shopifysvc.com https://www.paypal.com https://www.google-analytics.com ; frame-ancestors 'none';
permissions-policypresent geolocation=(), midi=(), sync-xhr=(), microphone=(), camera=(), magnetometer=(), gyroscope=(), fullscreen=(self), interest-cohort=()
referrer-policypresent no-referrer
strict-transport-securitypresent max-age=31536000
x-content-type-optionspresent nosniff
x-frame-optionspresent DENY

Response headers

Cookie protections

Passive observation

No Set-Cookie header was observed on the sampled homepage response. Other pages may set cookies separately.

Detected stack

Technologies

Bootstrap 80% Tailwind CSS 72%

Versions are shown only when publicly exposed by the page or response headers. An observed version is not, by itself, proof of a vulnerability.

JavaScript library advisories

3 sampled JavaScript files checked locally with Retire.js. Database snapshot: 2026-09-29T02:40:05.559Z.

No supported library version was identified in the sampled files. This does not establish that the scripts are safe.

A version match is not proof that the website is infected or that an issue is exploitable here. Owners should review the advisory, check whether their code is affected and test an update. Up to four external script files are sampled, not every dependency, inline script or dynamically loaded resource.

About this website

What the site says about itself

Let’s Encrypt is a free, automated, and open Certificate Authority (CA), run for the public’s benefit. It is a service provided by the Internet Security Research Group (ISRG). We give people the digital certificates they need in order to enable HTTPS (SSL/TLS) for websites, for free, in the most user-friendly way we can. We do this because we want to create a more secure and privacy-respecting Web. You can read about our most recent year in review by downloading our annual report.

View the site's About page ↗

This is publisher supplied information. The independent safety findings are shown separately.

Publisher supplied

Public contact details

These details were observed on the website, not independently verified as an active support channel.

Emailpress@letsencrypt.orgSource: https://letsencrypt.org/contact/
Emailsponsor@letsencrypt.orgSource: https://letsencrypt.org/contact/
Emailprivacy@abetterinternet.orgSource: https://letsencrypt.org/contact/

Structured facts

Website identity & response

Public page metadata
Page titleLet's Encrypt
First headingEncryption for Everybody
DescriptionLet's Encrypt is a free, automated, and open Certificate Authority brought to you by the nonprofit Internet Security Research Group (ISRG). Read all about our nonprofit work this year in our 2025 Annual Report.
Canonical URLhttps://letsencrypt.org/
Final URLhttps://letsencrypt.org/
HTTP response200 · text/html; charset=UTF-8 · duration unavailable
Languageen-US
Structured typesNone observed
Faq page detectedhttps://letsencrypt.org/docs/faq/Page page detectedhttps://letsencrypt.org/blog/About page detectedhttps://letsencrypt.org/about/Contact page detectedhttps://letsencrypt.org/contact/
present100% evidence confidence
Security txt.has policy100% evidence confidence
1100% evidence confidence
Security txt.expires valid100% evidence confidence
1100% evidence confidence
1100% evidence confidence
en-US100% evidence confidence
1100% evidence confidence
1100% evidence confidence
1100% evidence confidence
1100% evidence confidence
Local headers.csp has object src100% evidence confidence
1100% evidence confidence
Local headers.cors wildcard origin100% evidence confidence
Local headers.cors present100% evidence confidence
Local headers.cors credentials with wildcard100% evidence confidence
1100% evidence confidence
27100% evidence confidence
2100% evidence confidence
5100% evidence confidence
unavailable100% evidence confidence
Dns consistency.cname present100% evidence confidence
1100% evidence confidence
Local headers.permissions usb restricted100% evidence confidence
4100% evidence confidence
Local headers.permissions payment restricted100% evidence confidence
1100% evidence confidence
1100% evidence confidence
1100% evidence confidence
1100% evidence confidence
Local headers.hsts preload100% evidence confidence
31536000100% evidence confidence
Local headers.hsts include subdomains100% evidence confidence
Local headers.csp wildcard sources100% evidence confidence
1100% evidence confidence

Connection path

Redirect chain

0 recorded hops

No redirect hop was recorded for the sampled homepage.

Premium monitoring

Catch downtime and security changes automatically

Regular checks, availability history, and alert emails are reserved for Premium websites. Free reports remain point-in-time scans and do not create recurring server work.

Enable monitoring for this website

Compared with the previous scan

What changed

A comparison will appear after the next completed scan.

Explainable matching

Digital fingerprint

fingerprint-v1
rapid-signal-wave-472

Comparable components help find technically related websites. A match does not prove common ownership.

DnsHashed private comparison value
TechnologiesHashed private comparison value

Material changes only

Change history

No meaningful changes recorded yet.

Website icon for letsencrypt.org

Visual evidence

Website screenshot

Screenshot of letsencrypt.org
Captured once in an isolated browser during this scan. Visual tint is an interface overlay. The original evidence is not duplicated.

For site owners

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Questions about letsencrypt.org

FAQ

Still have questions? Contact us →
Is letsencrypt.org safe to visit?

The latest Safety Score is 79/100 with 75% Evidence Confidence. This is a point-in-time assessment of observed technical signals, not a guarantee. Check the exact address and avoid entering payment details if anything looks unusual.

Did the scan detect malware on letsencrypt.org?

ClamAV found no signature match in the sampled homepage HTML. External scripts, downloads and private server files were not checked. This is not a whole-site malware clearance.

When was letsencrypt.org registered?

The public registry record shows Jul 7, 2014. Registration details may be privacy-protected or updated later.

Did letsencrypt.org have a valid TLS certificate?

The scanner observed a valid TLS certificate using TLSv1.3. A valid certificate alone does not establish that the site is safe.

How does letsencrypt.org describe itself?

The website's About page describes its purpose in the report above. This is publisher-supplied information and is separate from independent security findings.

Can a paid listing change this website's score?

No. Premium placement and owner-supplied pages are labelled separately. Technical evidence, the Safety Score and moderation decisions remain independent.