indexo.dev

mobilesystemdesign.com

.com crawl

First seen 2026-04-12 · Last seen 2026-05-07 · ok HTTP/1.1 200 122 ms crawled 2026-05-19

US · 162.159.140.98 · AS13335 Cloudflare, Inc.

Reputation 89/100 weak security headers dmarc monitor-only

Classifying

HTML metadata

Title
Mobile System Design Book by Tjeerd in 't Veen | Expert Guide for iOS & Android Developers
Description
Learn to design scalable, maintainable mobile apps with expert insights. Explore the Mobile System Design book, interview guide, and in-depth articles for mobile developers.
Language
en-US
Canonical
https://www.mobilesystemdesign.com/

Open Graph

url
https://www.mobilesystemdesign.com/
title
Mobile System Design Book by Tjeerd in 't Veen | Expert Guide for iOS & Android Developers
description
Learn to design scalable, maintainable mobile apps with expert insights. Explore the Mobile System Design book, interview guide, and in-depth articles for mobile developers.

Technology

CDN
Cloudflare
Analytics
  • Google Tag Manager
Fonts
  • Google Fonts
Social widgets
  • YouTube Embed
Third-party hosts loaded (7)
  • fonts.googleapis.com×2
  • www.youtube.com×2
  • assets.lemonsqueezy.com×1
  • cdn.paritydeals.com×1
  • fonts.gstatic.com×1
  • mobilesystemdesign.substack.com×1
  • www.googletagmanager.com×1

Social

Registration

Registrar
Key-Systems GmbH
Created
2022-12-13
Expires
2026-12-13 206 days left
Updated
2025-12-14
Name servers
  • ns0.transip.net
  • ns1.transip.nl
  • ns2.transip.eu

DNS records live

NS
  • ns0.transip.net
  • ns1.transip.nl
  • ns2.transip.eu
MX
  • 10 mx.transip.email
Verified for
  • Google

Email authentication partial

SPF
v=spf1 include:_spf.transip.email ~all
softfail (~all)
DMARC
v=DMARC1; p=none;
policy: none (monitoring only)
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-05-03 to 2026-08-02
Expires in 73 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://mobilesystemdesign.com/

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

Links to (5)

Linked from (1)