indexo.dev

variationtheory.com

.com crawl

First seen 2026-04-16 · Last seen 2026-04-16 · ok HTTP/1.1 200 1087 ms crawled 2026-05-11

DE · 92.113.23.59 · AS47583 Hostinger International Limited

Reputation 92/100 no dmarc policy

sector education type landing page

HTML metadata

Title
Variation Theory – Sequences and behaviour to enable mathematical thinking in the classroom – by Craig Barton @mrbartonmaths
Language
en-GB
Generator
Sender.net 2.10.17
Canonical
https://variationtheory.com/
Feeds

Open Graph

url
https://variationtheory.com/
title
Variation Theory
locale
en_GB
site name
Variation Theory
description
Sequences and behaviour to enable mathematical thinking in the classroom - by Craig Barton @mrbartonmaths

Technology

Server
hcdn
CMS
WordPress
Analytics
  • Google Tag Manager
Ads
  • Google AdSense
Fonts
  • Google Fonts
Third-party hosts loaded (16)
  • i0.wp.com×11
  • fonts.googleapis.com×3
  • pagead2.googlesyndication.com×3
  • stats.wp.com×2
  • www.googletagmanager.com×2
  • 0.gravatar.com×1
  • 1.gravatar.com×1
  • 2.gravatar.com×1
  • eedi.substack.com×1
  • gmpg.org×1
  • s0.wp.com×1
  • secure.gravatar.com×1
  • tipsforteachers.substack.com×1
  • v0.wordpress.com×1
  • widgets.wp.com×1
  • wp.me×1

Social

Registration

Registrar
HOSTINGER operations, UAB
Created
2018-02-09
Expires
2027-02-09 265 days left
Updated
2025-08-16
Name servers
  • ns1.dns-parking.com
  • ns2.dns-parking.com

DNS records live

NS
  • ns1.dns-parking.com
  • ns2.dns-parking.com
MX
  • 10 mx2.hostinger.co.uk
  • 5 mx1.hostinger.co.uk

Email authentication weak

SPF
v=spf1 include:_spf.mail.hostinger.com ~all
softfail (~all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R12
from 2026-04-03 to 2026-07-02
Expires in 44 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://variationtheory.com/

present
  • content-security-policy
findings
  • missing HSTS
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
content-security-policy
upgrade-insecure-requests

Links to (13)

Linked from (1)