indexo.dev

diveintosystems.org

.org crawl

First seen 2026-04-14 · Last seen 2026-05-07 · ok HTTP/1.1 200 1190 ms crawled 2026-05-07

US · 18.189.155.174 · AS16509 Amazon.com, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
Dive into Systems
Language
en
Generator
Asciidoctor 2.0.18

Technology

Server
lighttpd
Analytics
  • Google Tag Manager
Fonts
  • Google Fonts

Third-party hosts loaded (3)

  • cdnjs.cloudflare.com×1
  • fonts.googleapis.com×1
  • www.googletagmanager.com×1

Contact

Email

Registration

Registrar
Amazon Registrar, Inc.
Created
2020-04-16
Expires
2027-04-16 332 days left
Updated
2026-05-06
Name servers
  • ns-1274.awsdns-31.org
  • ns-2024.awsdns-61.co.uk
  • ns-334.awsdns-41.com
  • ns-969.awsdns-57.net

DNS records live

NS
  • ns-1274.awsdns-31.org
  • ns-2024.awsdns-61.co.uk
  • ns-334.awsdns-41.com
  • ns-969.awsdns-57.net
MX
  • 10 allspice.cs.swarthmore.edu

Email authentication weak

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

Certificate (current)

R12
from 2026-03-27 to 2026-06-25
Expires in 37 days

Full certificate history on crt.sh ↗

HTTP security headers

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

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

Links to (9)

Linked from (1)