indexo.dev

1728.org

.org crawl

First seen 2026-05-30 · Last seen 2026-05-31 · ok HTTP/1.1 200 852 ms crawled 2026-05-31

US · 104.21.13.154 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
CALCULATOR CITY: Resource for Mathematics, Algebra, Geometry, Trigonometry, Calculus, Finance, Measurement, Chemistry, Physics, Astronomy
Description
Calculator City, calculators for algebra, geometry, trigonometry, calculus, finance, astronomy, physics, chemistry, time cards, HTML Colors, percentages, fractions

Technology

CDN
Cloudflare
Analytics
  • Google Tag Manager
Ads
  • Google AdSense

Third-party hosts loaded (5)

  • pagead2.googlesyndication.com×3
  • cdn.attracta.com×2
  • d5nxst8fruw4z.cloudfront.net×1
  • static.getclicky.com×1
  • www.googletagmanager.com×1

Social

DNS records live

NS
  • hasslo.ns.cloudflare.com
  • sonia.ns.cloudflare.com
MX
  • 15 route3.mx.cloudflare.net
  • 30 route2.mx.cloudflare.net
  • 69 route1.mx.cloudflare.net
Verified for
  • Google

Email authentication weak

SPF
v=spf1 include:_spf.mx.cloudflare.net ~all
softfail (~all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-05-28 to 2026-08-26
Expires in 86 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://www.1728.org/

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

Links to (12)

Linked from (1)