indexo.dev

learn-c.org

.org crawl

First seen 2026-06-01 · Last seen 2026-06-04 · ok HTTP/1.1 200 337 ms crawled 2026-06-02

US · 192.241.245.44 · AS14061 DigitalOcean, LLC

Reputation 95/100 weak security headers

sector education type docs

HTML metadata

Title
Learn C - Free Interactive C Tutorial
Description
learn-c.org is a free interactive C tutorial for people who want to learn C, fast.
Language
en

Open Graph

url
https://www.learn-c.org
title
Learn C - Free Interactive C Tutorial

Technology

CDN
Cloudflare
CMS
Gatsby
jQuery
1.12.4 known XSS (<3.5)
Analytics
  • Google Tag Manager
Ads
  • Google AdSense

Third-party hosts loaded (5)

  • cdnjs.cloudflare.com×2
  • buttons.github.io×1
  • code.jquery.com×1
  • pagead2.googlesyndication.com×1
  • www.googletagmanager.com×1

Social

Registration

Registrar
GoDaddy.com, LLC
Created
2013-02-19
Expires
2027-02-19 259 days left
Updated
2026-04-05
Name servers
  • ns1.digitalocean.com
  • ns2.digitalocean.com
  • ns3.digitalocean.com

DNS records live

NS
  • ns1.digitalocean.com
  • ns2.digitalocean.com
  • ns3.digitalocean.com
Verified for
  • Google

Email authentication no MX

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

Certificate (current)

E8
from 2026-05-21 to 2026-08-19
Expires in 75 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://learn-c.org/

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

Links to (21)

Linked from (15)