indexo.dev

libretexts.org

.org toplist crawl

First seen 2026-04-11 · Last seen 2026-05-18 · ok HTTP/1.1 200 1164 ms crawled 2026-05-18

US · 104.20.33.226 · AS13335 Cloudflare, Inc.

Reputation 100/100

Classifying

HTML metadata

Title
Home | LibreTexts
Language
en
Generator
Drupal 10 (https://www.drupal.org)
Canonical
https://libretexts.org/
Translations
  • en

Technology

CDN
Cloudflare
CMS
Drupal
Fonts
  • Google Fonts

Third-party hosts loaded (3)

  • cdn.libretexts.net×2
  • fonts.googleapis.com×1
  • static.addtoany.com×1

Social

Registration

Registrar
Squarespace Domains II LLC
Created
2016-07-22
Expires
2026-07-22 63 days left
Updated
2025-07-17
Name servers
  • celine.ns.cloudflare.com
  • ridge.ns.cloudflare.com

DNS records live

NS
  • celine.ns.cloudflare.com
  • ridge.ns.cloudflare.com
MX
  • 1 aspmx.l.google.com
  • 10 alt3.aspmx.l.google.com
  • 10 alt4.aspmx.l.google.com
  • 5 alt1.aspmx.l.google.com
  • 5 alt2.aspmx.l.google.com
TXT
Show 5 TXT records
  • google-site-verification=zIAad45IZShT-a7Q2GnGn7XjbofS1NobaXCuldPdF58
  • 1password-site-verification=YDXLXEOPD5A4RIQ4DGBXTTLXAU
  • MS=24EEDA32A1B64093067F80942348F46B7C53AB15
  • atlassian-domain-verification=K5DMrg/KPVIJcji/XYQ5GaWR5qtDtay27IEufDV87yqJmqX4uKhjhgZxNMajMm2w
  • google-site-verification=ej-DagC8sD_MaouJikcyiz-sulM4oKdtg95K_XZJLjc

Email authentication strong

SPF
v=spf1 include:_spf.google.com include:mailgun.org include:spf.mailjet.com ~all
softfail (~all)
DMARC
v=DMARC1; p=quarantine; ruf=mailto:dev@libretexts.org; fo=1; rua=mailto:aed54a8da9d94419b5651cf163384e92@dmarc-reports.cloudflare.net;
policy: quarantine
DKIM
  • google: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmE03ZLJpo2N9QlCsH8jIPIWhgNAHn5OxHdJGV/Ay72jd/R3triwYdJiIlkYqZRLXRFu7ntOLmgjLr9…
selectors probed

Certificate (current)

WE1
from 2026-04-28 to 2026-07-27
Expires in 69 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 65/100 Checked live page: https://libretexts.org/

present
  • strict-transport-security
  • x-frame-options
  • x-content-type-options
findings
  • missing Content Security Policy
  • weak frame protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
x-frame-options
SAMEORIGIN, SAMEORIGIN
x-content-type-options
nosniff
strict-transport-security
max-age=63072000

Links to (3)

Linked from (1)