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Categories: Education & Learning

OpenStax is the world’s largest publisher of open education resources (OER) and a provider of integrated learning technologies and education research for high school and college. We are a global nonprofit at Rice University.

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Updated: 2026-09-22 01:36 Language: English (default) Access: Normal

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What is openstax.org?
OpenStax is the world’s largest publisher of open education resources (OER) and a provider of integrated learning technologies and education research for high school and college. We are a global nonprofit at Rice University.
Does openstax.org offer paid content?
Unknown.
What languages does openstax.org support?
Primary language: English.
How can I visit openstax.org?
Use the Visit website link to open the website in a new tab.
What are some alternatives to openstax.org?
Related websites include yousician.com, york.ac.uk, yogababy.com.au, yellowquill.org, xtremegymnastics.com, xpansiv.com. 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 2011, this domain has about 15 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 .org extension, which is not an independent safety signal.

DNS and Email

The lowest TTL is 13 seconds, supporting rapid record changes at the cost of more frequent lookups. Nameservers are provided by Amazon Route 53, indicating managed DNS hosting. MX records point to the Google Workspace email service. No CNAME was found; the observed records resolve directly to addresses. SPF and DMARC are configured. DKIM status is unknown.

TLS and Certificates

The certificate uses an RSA 2048-bit public key, offering broad client compatibility. 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 Amazon cloud or CDN ecosystem. The certificate is valid for about 197 days in total, with 187 days remaining.

HTTP and Browser Security

The checked browser-security headers were not detected, leaving fewer explicit browser-side safeguards. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. The x-cache, via 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 contains the custom value AmazonS3.

Technology Stack Analysis

The public page identifies Google Tag Manager, Amazon CloudFront without precise versions, leaving fewer clues for version-specific scanning.

Search and Social Sharing

The title has 96 characters and may be truncated in search results. The meta description has 224 characters and may be shortened in search results. Twitter Card metadata is configured. The observed directives allow indexing and link following. No Generator meta tag is publicly exposed.

Hosting and Email

DNSAmazon Route 53
HostingAmazon CloudFront
EmailGoogle Workspace
Location United States flagSeattle, Washington, United States 18.160.46.108

User reviews (0)

  • No reviews yet.

Pages, Search and Sharing

Meta descriptionOpenStax is the world’s largest publisher of open education resources (OER) and a provider of integrated learning technologies and education research for high school and college. We are a global nonprofit at Rice University.
Canonical URLhttps://openstax.org
LanguageEnglish (default)
Twitter Cardsummary_large_image

Social Sharing Preview

12 fields

robots.txt (opens in a new tab)

15 rules
All bots 0 allowed · 14 disallowed
  • Disallow/accounts
  • Disallow/admin
  • Disallow/l/
  • Disallow/r/
  • Disallow/confirmation/
  • Disallow/adoption-confirmation
  • Disallow/general
  • Disallow/contents
  • Disallow/extras
  • Disallow/errata
  • Disallow/resources
  • Disallow/apps/archive
  • Disallow/apps/archive-preview
  • Disallow/apps/cms/api/spike
gptbot 0 allowed · 1 disallowed
  • Disallow/books/

Sitemaps

2

Registration details RDAP / WHOIS

RegistrarGoDaddy.com, LLC
Registered2011-09-27
Expires2032-09-27
Domain statusclient delete prohibited、client renew prohibited、client transfer prohibited、client update prohibited
Nameserversns-1195.awsdns-21.org、ns-2027.awsdns-61.co.uk、ns-358.awsdns-44.com、ns-602.awsdns-11.net
DNSSECunsigned

DNS records

TypeNameValueTTLPriority
Aopenstax.org18.160.46.10813—
Aopenstax.org18.160.46.2313—
Aopenstax.org18.160.46.7513—
Aopenstax.org18.160.46.9613—
MXopenstax.orgaspmx.l.google.com360010
MXopenstax.orgalt1.aspmx.l.google.com360020
MXopenstax.orgalt2.aspmx.l.google.com360020
MXopenstax.orgaspmx2.googlemail.com360030
MXopenstax.orgaspmx3.googlemail.com360030
MXopenstax.orgaspmx4.googlemail.com360030
MXopenstax.orgaspmx5.googlemail.com360030
NSopenstax.orgns-1195.awsdns-21.org172800—
NSopenstax.orgns-2027.awsdns-61.co.uk172800—
NSopenstax.orgns-358.awsdns-44.com172800—
NSopenstax.orgns-602.awsdns-11.net172800—
TXTopenstax.org1password-site-verification=USDQ5N76BVCB5CXXBSZ34POROQ3600—
TXTopenstax.orgMS=ms583838683600—
TXTopenstax.organthropic-domain-verification-ewhe7h=S2BgAeCil3ayY972YJsaqRznM3600—
TXTopenstax.orgatlassian-domain-verification=IeWskTgDRHjMBD/AeaXlwcXbCXDdoqiNm6hPjtGUaSoBr/4xG7gqEm9788fEzLyZ3600—
TXTopenstax.orgfacebook-domain-verification=qehn0rayh30a1mrjbmt6ncx7lf6evi3600—
TXTopenstax.orggoogle-site-verification=5P1KHg2sIon0NiYhjrIxuLk_EZtd2bdHOJwMh9DcyFc3600—
TXTopenstax.orggoogle-site-verification=h-yRpYjInlbkB3Sngplfqbq70q0CYVvoJ-w1070hHOM3600—
TXTopenstax.orggoogle-site-verification=kU898HQbWPBk88hCzxxput41Du008GyrmHuZ_0tu-XU3600—
TXTopenstax.orgij7237pjdbunduigm3aog31coa3600—
TXTopenstax.orgpardot218812=cad18a59f84a76dac099a1090cfe14fb86bfda2f2f3b1049d3ca49550886ddb73600—
TXTopenstax.orgv=spf1 include:_spf.google.com include:amazonses.com include:spf1.formassembly.com include:_spf.salesforce.com include:aspmx.pardot.com ~all3600—
TXTopenstax.orgzapier-domain-verification-challenge=59ee21a1-c3d3-4c41-81c0-a6cffde575a53600—
DMARC_dmarc.openstax.orgv=DMARC1; p=none; sp=none; rua=mailto:[email protected]; aspf=r; pct=100300—

TLS and certificates

AssessmentNormal configuration
Supported protocolsTLSv1.2、TLSv1.3
Negotiated protocolTLSv1.3
Certificate subjectopenstax.org
IssuerAmazon
Valid until2027-03-28T23:59 · Remaining when checked: 187 days
Verification detailsCertificate trust: Passed · Hostname match: Passed

HTTP response headers

HeaderValue
content-typetext/html
cache-controlpublic, max-age=60
serverAmazonS3

Identified technologies

Google Tag ManagerAmazon CloudFront

Recent Updates

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