indexo.dev

whatthecss.com

.com crawl

First seen 2026-04-11 · Last seen 2026-05-19 · ok HTTP/1.1 200 1134 ms crawled 2026-05-19

US · 185.199.109.153 · AS54113 Fastly, Inc.

Reputation 87/100 weak security headers no dmarc policy

sector education type landing page

HTML metadata

Title
What the CSS | 30-Day Email Course
Description
A 30 day email based course teaching CSS fundamentals via fun daily challenges and exercises.

Open Graph

url
https://whatthecss.com
title
What the CSS?! 30-Day Email Course
description
What the CSS?! is a 30 day email based course teaching CSS fundamentals via fun daily challenges and exercises.

Technology

CDN
Fastly
Server
GitHub.com
Analytics
  • Google Tag Manager
Fonts
  • Font Awesome
  • Google Fonts

Third-party hosts loaded (3)

  • use.fontawesome.com×2
  • fonts.googleapis.com×1
  • www.googletagmanager.com×1

Social

Registration

Registrar
NameCheap, Inc.
Created
2017-10-28
Expires
2026-10-28 161 days left
Updated
2025-10-30
Name servers
  • dns1.registrar-servers.com
  • dns2.registrar-servers.com

DNS records live

NS
  • dns1.registrar-servers.com
  • dns2.registrar-servers.com
MX
  • 1 aspmx.l.google.com
  • 10 alt3.aspmx.l.google.com
  • 10 alt4.aspmx.l.google.com
  • 5 alt1.aspmx.l.google.com
  • 5 alt2.aspmx.l.google.com
TXT
  • google-site-verification=SDOWX402TVb2QKB0kPFZfH41qwEyoBJheF1HBrsRiu0

Email authentication weak

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

Certificate (current)

R13
from 2026-04-23 to 2026-07-22
Expires in 63 days

Full certificate history on crt.sh ↗

HTTP security headers

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

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

Links to (4)

Linked from (1)