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cliffsnotes.com

CliffsNotes is the original (and most widely imitated) study guide. CliffsNotes study guides are written by real teachers and professors, so no matter what you're studying, CliffsNotes can ease your homework headaches and help you score high on exams. Founded in 1958 by Clifton Keith Hillegass, CliffsNotes is the original company that produced study guides and book summaries ranging from Shakespeare to Algebra and the SAT!

Education & Learning
No paid content found
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Profile views 13 Outbound visits 3 Normal
CliffsNotes Full homepage screenshot

At a glance

Category
Education & Learning
Language
English
Paid-content signal
No paid content foundObserved
Registered
1995
Hosting
CloudflareInferred
HTTPS certificate trusted
PassedObserved
Last updated

Related questions

More questions →
What is cliffsnotes.com?
CliffsNotes is the original (and most widely imitated) study guide. CliffsNotes study guides are written by real teachers and professors, so no matter what you're studying, CliffsNotes can ease your homework headaches and help you score high on exams. Founded in 1958 by Clifton Keith Hillegass, CliffsNotes is the original company that produced study guides and book summaries ranging from Shakespeare to Algebra and the SAT!
Does cliffsnotes.com offer paid content?
Unknown.
What languages does cliffsnotes.com support?
Primary language: English.
How can I visit cliffsnotes.com?
Use the Visit website link to open the website in a new tab.
What are some alternatives to cliffsnotes.com?
Related websites include zerotothree.org, zbib.org, zathura.dev, yousician.com, yourcommission.org, yorku.ca. Compare their features and pricing for your needs.

Website Overview

An established domain and managed infrastructure suggest continuity of operations and may support dependable delivery, although neither guarantees service quality. Several search or sharing settings need attention. Together they may make snippets, preview images or preferred URLs less consistent across platforms.

Domain and Registration

Registered in 1995, this domain has about 31 years of history. That suggests continuity, although ownership and purpose may have changed. Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The registrar is GoDaddy.com, LLC, a widely used domain service provider. The domain uses the common .com extension, which is not an independent safety signal.

DNS and Email

The observed email authentication setup is incomplete: DMARC is missing. Nameservers are provided by Cloudflare, indicating managed DNS hosting. MX records point to the Google Workspace email service. No CNAME was found; the observed records resolve directly to addresses. TXT records include verification markers for Google. Such markers may also remain after a service stops being used.

TLS and Certificates

The public key uses EC with 256 bits. The server supplied a complete certificate chain. No organization name is present in the certificate; the available fields are consistent with domain validation. The certificate was issued within the Google Trust Services cloud or CDN ecosystem. The certificate's total validity is about 90 days, consistent with a short renewal cycle.

HTTP and Browser Security

The response lacks these common security headers: X-Content-Type-Options, Referrer-Policy, Permissions-Policy. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. The cf-ray response header indicates a CDN or caching proxy in the delivery path. No obvious internal addresses or debug information were found in the headers. The Server header identifies cloudflare without an exact version.

Technology Stack Analysis

The public page identifies React, Tailwind CSS, Google Tag Manager, Google Analytics, Cloudflare without precise versions, leaving fewer clues for version-specific scanning.

Search and Social Sharing

The title has 111 characters and may be truncated in search results. The meta description has 430 characters and may be shortened in search results. No Open Graph metadata was detected, so social previews may depend on platform inference. Twitter Card metadata is configured. JSON-LD includes Organization data, helping describe the organization as an entity.

Hosting and Email
DNSCloudflare
HostingCloudflare
EmailGoogle Workspace
Approximate IP geolocation (inferred; a CDN or proxy may differ from the origin server) Location unknown Inferred 104.18.39.119

Registration details

RDAP / WHOIS

RegistrarGoDaddy.com, LLC
Registered1995-08-19
Expires2027-08-18
Domain statusclient delete prohibited、client renew prohibited、client transfer prohibited、client update prohibited
Nameserverslangston.ns.cloudflare.com、liv.ns.cloudflare.com
DNSSECunsigned

DNS records

DNS

TypeNameValueTTLPriority
Awww.cliffsnotes.com104.18.39.119300—
Awww.cliffsnotes.com172.64.148.137300—
MXcliffsnotes.comaspmx.l.google.com3001
MXcliffsnotes.comalt1.aspmx.l.google.com3005
MXcliffsnotes.comalt2.aspmx.l.google.com3005
MXcliffsnotes.comalt3.aspmx.l.google.com30010
MXcliffsnotes.comalt4.aspmx.l.google.com30010
NScliffsnotes.comlangston.ns.cloudflare.com86400—
NScliffsnotes.comliv.ns.cloudflare.com86400—
TXTcliffsnotes.comglobalsign-domain-verification=28DB9FCEFBA2745B7F57EF614E9B8F17300—
TXTcliffsnotes.comglobalsign-domain-verification=D151191065D1DFB61FF73EF164ECC37A300—
TXTcliffsnotes.comgoogle-site-verification=iujjMUAxV_bg2LRj8PkpLpD8iSYrUDl8zEJUG91aks0300—
TXTcliffsnotes.comv=spf1 a mx include:_spf.google.com include:mail.zendesk.com include:amazonses.com redirect=cliffsnotes.com.hosted.spf-report.com include:helpscoutemail.com ~all300—

TLS and certificates

TLS / SSL

AssessmentNormal configuration
Supported protocolsTLSv1.2、TLSv1.3
Negotiated protocolTLSv1.3
Certificate subjectcliffsnotes.com
IssuerGoogle Trust Services
Valid until2026-12-13T00:15 · Remaining when checked: 78 days
Verification detailsCertificate trust: Passed · Hostname match: Passed

HTTP response headers

HTTP

HeaderValue
content-typetext/html; charset=UTF-8
servercloudflare
strict-transport-securitymax-age=31536000; includeSubDomains; preload
content-security-policyframe-ancestors 'self'; report-uri https://api.coursehero.com/v1/csp-report-forwarder
set-cookieRedacted

Identified technologies
ReactTailwind CSSGoogle Tag ManagerGoogle AnalyticsCloudflare

Pages, Search and Sharing
Meta descriptionCliffsNotes is the original (and most widely imitated) study guide. CliffsNotes study guides are written by real teachers and professors, so no matter what you're studying, CliffsNotes can ease your homework headaches and help you score high on exams. Founded in 1958 by Clifton Keith Hillegass, CliffsNotes is the original company that produced study guides and book summaries ranging from Shakespeare to Algebra and the SAT!
Canonical URLhttps://www.cliffsnotes.com/
LanguageEnglish (default)
Twitter Cardsummary_large_image

Social Sharing Preview

4 fields

robots.txt (opens in a new tab)

74 rules
All bots 4 allowed · 29 disallowed
  • Allow/register$
  • Allow/subscribe/plans$
  • Allow/users/log-in$
  • Allow/users/sign-up$
  • Disallow/documents/
  • Disallow/doc-asset/bg/qattachments
  • Disallow/qa/attachment/
  • Disallow/tutors-problems/assets
  • Disallow/api/user
  • Disallow/CliffsNotes/Handlers
  • Disallow/404.aspx
  • Disallow/Cliffsnotes/TEST/img/test.jpg
  • Disallow/forecast
  • Disallow/account/Sign-In-Register
  • Disallow/file/
  • Disallow/api/
  • Disallow/site/
  • Disallow*/aggregate$
  • Disallow*/download$
  • Disallow/ggothing-recisitinue-woman-in-Come-For-take-ther
  • Disallow/_Incapsula_Resource
  • Disallow/exclusive-doc/
  • Disallow/exclusive-qna/
  • Disallow/doc-asset/font/
  • Disallow*/fonts.css
  • Disallow/register*
  • Disallow/subscribe/plans*
  • Disallow/users/log-in*
  • Disallow/users/sign-up*
  • Disallow/account%252F
  • Disallow/subscribe%252Fplans
  • Disallow/users%252Flog-in
  • Disallow/users%252Fsign-up
gptbot 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
amazonbot 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
ccbot 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
google-extended 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
anthropic-ai 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
claude-web 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
claudebot 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
perplexitybot 4 allowed · 1 disallowed
  • Allow/$
  • Allow/terms-of-service
  • Allow/privacy-policy
  • Allow/disclaimer
  • Disallow/
firecrawlagent 0 allowed · 1 disallowed
  • Disallow/

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