indexo.dev

semantic-web-book.org

.org crawl

First seen 2026-05-20 · Last seen 2026-05-30 · ok HTTP/1.1 200 4346 ms crawled 2026-05-27

DE · 116.203.61.64 · AS24940 Hetzner Online GmbH

Reputation 67/100 listed in spam blocklist no dmarc policy

Classifying

HTML metadata

Title
Introduction to Semantic Web Technologies
Language
en
Generator
MediaWiki 1.15.0
Feeds

Technology

Server
Apache

Third-party hosts loaded (2)

  • creativecommons.org×1
  • i.creativecommons.org×1

Social

Registration

Registrar
united-domains GmbH
Created
2008-09-17
Expires
2026-09-17 107 days left
Updated
2026-04-04
Name servers
  • ns.udag.org
  • ns.udag.de
  • ns.udag.net

DNS records live

NS
  • ns.udag.de
  • ns.udag.net
  • ns.udag.org
MX
  • 10 mx00.udag.de
  • 20 mx01.udag.de

Email authentication weak

SPF
not published
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R13
from 2026-05-23 to 2026-08-21
Expires in 81 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 75/100 Checked live page: https://www.semantic-web-book.org/

present
  • strict-transport-security
  • x-frame-options
  • x-content-type-options
  • referrer-policy
findings
  • missing Content Security Policy
  • missing Permissions Policy
Header values
referrer-policy
strict-origin-when-cross-origin
x-frame-options
sameorigin
x-content-type-options
nosniff
strict-transport-security
max-age=63072000

Links to (8)

Linked from (2)