openstax.org

.org crawl

First seen 2026-04-14 · Last seen 2026-05-18 · ok HTTP/1.1 200 2231 ms crawled 2026-05-07

US · 18.165.140.94 · AS16509 Amazon.com, Inc.

Reputation 89/100 weak security headers dmarc monitor-only

Classifying

HTML metadata

Title: OpenStax
Description: OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects!
Language: en-US

Open Graph

url: https://openstax.org/
title: OpenStax | Free Textbooks Online with No Catch
description: OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects!

Technology

CDN: Amazon CloudFront
Server: AmazonS3

Ads

Meta Pixel

Third-party hosts loaded (3)

connect.facebook.net×1
script.crazyegg.com×1
www.facebook.com×1

Registration

Registrar

GoDaddy.com, LLC

Created

2011-09-27

Expires

2032-09-27 2322 days left

Updated

2024-06-25

Name servers

ns-1195.awsdns-21.org
ns-2027.awsdns-61.co.uk
ns-358.awsdns-44.com
ns-602.awsdns-11.net

DNS records live

NS

ns-1195.awsdns-21.org
ns-2027.awsdns-61.co.uk
ns-358.awsdns-44.com
ns-602.awsdns-11.net

MX

Show 7 MX records

10 aspmx.l.google.com
20 alt1.aspmx.l.google.com
20 alt2.aspmx.l.google.com
30 aspmx2.googlemail.com
30 aspmx3.googlemail.com
30 aspmx4.googlemail.com
30 aspmx5.googlemail.com

TXT

Show 10 TXT records

google-site-verification=h-yRpYjInlbkB3Sngplfqbq70q0CYVvoJ-w1070hHOM
google-site-verification=kU898HQbWPBk88hCzxxput41Du008GyrmHuZ_0tu-XU
ij7237pjdbunduigm3aog31coa
pardot218812=cad18a59f84a76dac099a1090cfe14fb86bfda2f2f3b1049d3ca49550886ddb7
zapier-domain-verification-challenge=59ee21a1-c3d3-4c41-81c0-a6cffde575a5
1password-site-verification=USDQ5N76BVCB5CXXBSZ34POROQ
MS=ms58383868
anthropic-domain-verification-ewhe7h=S2BgAeCil3ayY972YJsaqRznM
facebook-domain-verification=qehn0rayh30a1mrjbmt6ncx7lf6evi
google-site-verification=5P1KHg2sIon0NiYhjrIxuLk_EZtd2bdHOJwMh9DcyFc

Email authentication strong

SPF

v=spf1 include:_spf.google.com include:amazonses.com include:spf1.formassembly.com include:_spf.salesforce.com include:aspmx.pardot.com ~all

softfail (~all)

DMARC

v=DMARC1; p=none; sp=none; rua=mailto:re+z9dvxwlow5b@inbound.dmarcdigests.com; aspf=r; pct=100

policy: none (monitoring only) · sp=none

DKIM

google: v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA593s+WnK+m4BiXwslyQpxOQqqOgEsydPDDOFIUJR6Oh6lDLuN+mO9/J2jxbC800PjR1TJsXn3fLVAdpi…

selectors probed

Certificate (current)

Amazon RSA 2048 M04

from 2025-10-12 to 2026-11-11

Expires in 175 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://openstax.org/

findings

missing HSTS
missing Content Security Policy
missing frame protection
missing content type protection
missing Referrer Policy
missing Permissions Policy