indexo.dev

calctool.org

.org crawl

First seen 2026-04-14 · Last seen 2026-05-14 · ok HTTP/1.1 200 1137 ms crawled 2026-05-14

US · 34.192.216.88 · AS14618 Amazon.com, Inc.

Reputation 87/100 weak security headers no dmarc policy

sector tech type homepage

HTML metadata

Title
CalcTool
Description
CalcTool provides 400 problem solvers, mainly connected with physics (but not limited to it!). The calculators are so easy and fast that you’ll never want to visit other web tools!
Language
en
Canonical
https://www.calctool.org/

Technology

Server
keycdn
Analytics
  • Google Analytics
  • Google Tag Manager

Third-party hosts loaded (2)

  • www.google-analytics.com×1
  • www.googletagmanager.com×1

Registration

Registrar
OVH sas
Created
2008-02-11
Expires
2028-02-11 631 days left
Updated
2025-02-10
Name servers
  • ns1.dnsimple.com
  • ns2.dnsimple.com
  • ns3.dnsimple.com
  • ns4.dnsimple.com

DNS records live

NS
  • ns1.dnsimple.com
  • ns2.dnsimple.com
  • ns3.dnsimple.com
  • ns4.dnsimple.com
MX
  • 10 mxa.mailgun.org
  • 10 mxb.mailgun.org
TXT
  • 1www.calctool.org
  • ALIAS for ab197a48be64745edb998eea2da5a44a-215ed5e3072e6a89.elb.us-east-1.amazonaws.com
Verified for
  • Google

Email authentication weak

SPF
v=spf1 include:mailgun.org ~all
softfail (~all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R12
from 2026-03-27 to 2026-06-25
Expires in 35 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 40/100 Checked live page: https://www.calctool.org/

present
  • x-frame-options
findings
  • missing HSTS
  • missing Content Security Policy
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
x-frame-options
SAMEORIGIN

Linked from (1)