indexo.dev

pretextbook.org

.org crawl

First seen 2026-04-16 · Last seen 2026-05-11 · ok HTTP/1.1 200 4245 ms crawled 2026-05-11

US · 74.207.233.115 · AS63949 Akamai Connected Cloud

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
PreTeXt - Write Once, Read Anywhere
Language
en
Generator
Pelican

Technology

Server
Apache
Analytics
  • Google Tag Manager
  • Statcounter

Third-party hosts loaded (2)

  • c.statcounter.com×1
  • www.googletagmanager.com×1

Social

Registration

Registrar
NameCheap, Inc.
Created
2017-06-29
Expires
2026-06-29 40 days left
Updated
2025-06-20
Name servers
  • dns1.registrar-servers.com
  • dns2.registrar-servers.com

DNS records live

NS
  • dns1.registrar-servers.com
  • dns2.registrar-servers.com
MX
  • 10 b285cb2c.21.ik2.com
  • 20 b285cb2c.22.ik2.io
  • 30 b285cb2c.23.ik2.eu

Email authentication weak

SPF
v=spf1 mx a ip4:173.255.249.21 ip6:2600:3c01::f03c:92ff:fef2:9fe6
no all qualifier
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

ZeroSSL ECC DV SSL CA 2
from 2026-04-01 to 2026-07-01
Expires in 42 days

Full certificate history on crt.sh ↗

HTTP security headers

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

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

Links to (6)

Linked from (2)