indexo.dev

classsizematters.org

.org crawl

First seen 2026-06-06 · Last seen 2026-06-06 · ok HTTP/1.1 200 86 ms crawled 2026-06-06

US · 198.71.233.96 · AS398787 GoDaddy.com, LLC

Reputation 87/100 weak security headers no dmarc policy

sector education type homepage

HTML metadata

Title
Class Size Matters | A clearinghouse for information on class size & the proven benefits of smaller classes
Language
en-US
Generator
WordPress 6.9.4
Canonical
https://classsizematters.org/
Feeds
active last post 25 days ago

Technology

CDN
Cloudflare
CMS
WordPress 6.9.4
jQuery
1.5.1 known XSS (<3.5)

Third-party hosts loaded (3)

  • ajax.googleapis.com×2
  • platform-api.sharethis.com×2
  • stats.wp.com×2

Registration

Registrar
GoDaddy.com, LLC
Created
2003-02-20
Expires
2027-02-20 254 days left
Updated
2026-04-06
Name servers
  • ns43.domaincontrol.com
  • ns44.domaincontrol.com

DNS records live

NS
  • ns43.domaincontrol.com
  • ns44.domaincontrol.com
MX
  • 0 classsizematters-org.mail.protection.outlook.com
Verified for
  • Google

Email authentication weak

SPF
v=spf1 include:spf.protection.outlook.com -all
strict (-all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-06-05 to 2026-09-03
Expires in 84 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://classsizematters.org/

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

Links to (11)

Linked from (1)

Use this data via API

Everything on this page for classsizematters.org is available as JSON from the indexo.dev REST & MCP API.

curl "https://indexo.dev/api/v1/domains/classsizematters.org" \
  -H "X-API-Key: idx_..."

Read the docs & get a free key →