indexo.dev

the-sysadmin-book.com

.com crawl

First seen 2026-05-10 · Last seen 2026-05-16 · ok HTTP/1.1 200 3284 ms crawled 2026-05-16

US · 172.67.203.221 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

sector tech type landing page

HTML metadata

Title
The Practice of System and Network Administration
Generator
All in One SEO (AIOSEO) 4.2.5.1
Canonical
https://the-sysadmin-book.com
Feeds

Open Graph

url
https://the-sysadmin-book.com
title
The Practice of System and Network Administration
locale
en_US
site name
The Practice of System and Network Administration | Third Edition

Technology

CDN
Cloudflare
CMS
WordPress
Fonts
  • Google Fonts

Third-party hosts loaded (1)

  • fonts.googleapis.com×1

Registration

Registrar
Gandi SAS
Created
2016-02-27
Expires
2027-02-27 283 days left
Updated
2026-01-27
Name servers
  • kim.ns.cloudflare.com
  • walt.ns.cloudflare.com

DNS records live

NS
  • kim.ns.cloudflare.com
  • walt.ns.cloudflare.com
MX
  • 0

Email authentication weak

SPF
v=spf1 -all
strict (-all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-04-07 to 2026-07-06
Expires in 47 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://the-sysadmin-book.com/

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

Links to (3)

Linked from (2)