indexo.dev

principal.dev

.dev crawl

First seen 2026-04-14 · Last seen 2026-05-10 · ok HTTP/1.1 200 439 ms crawled 2026-05-07

US · 104.21.5.246 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
The Principal Dev – Certification Masterclass for Tech Leads
Description
The Principal Dev is a two-day certification masterclass for lead developers, team leaders, and tech leads.
Language
en

Open Graph

url
https://principal.dev
title
The Principal Dev – Certification Masterclass for Tech Leads
description
The Principal Dev is a two-day certification masterclass for lead developers, team leaders, and tech leads.

Technology

CDN
Cloudflare
Analytics
  • Cloudflare Insights
Fonts
  • Font Awesome
  • Google Fonts

Third-party hosts loaded (5)

  • cdnjs.cloudflare.com×3
  • a.dev.events×1
  • fonts.googleapis.com×1
  • static.cloudflareinsights.com×1
  • use.fontawesome.com×1

Social

DNS records live

NS
  • charles.ns.cloudflare.com
  • tina.ns.cloudflare.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
Verified for
  • Google

Email authentication weak

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

Certificate (current)

WE1
from 2026-04-19 to 2026-07-18
Expires in 58 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 45/100 Checked live page: https://principal.dev/

present
  • x-content-type-options
  • referrer-policy
findings
  • missing HSTS
  • missing Content Security Policy
  • missing frame protection
  • missing Permissions Policy
Header values
referrer-policy
strict-origin-when-cross-origin
x-content-type-options
nosniff

Links to (5)

Linked from (2)