calculator.io

.io crawl

First seen 2026-04-13 · Last seen 2026-05-20 · ok HTTP/1.1 200 585 ms crawled 2026-05-06

US · 172.67.72.174 · AS13335 Cloudflare, Inc.

Reputation 97/100 dmarc monitor-only

Classifying

HTML metadata

Title
Calculator+iO — Online Calculators for Fitness, Science, Math, Finance, Health
Description
Find the calculator you need with our extensive collection of free online calculators! We've got you covered from finance to math, health to physics. Try it now!
Language
en
Canonical
https://www.calculator.io/
Translations
  • ar
  • de
  • en
  • es
  • fa
  • fr
  • hi
  • id
  • it
  • ja
  • ko
  • nl
  • pl
  • pt
  • ru
  • th
  • tr
  • vi
  • zh

Open Graph

url
https://www.calculator.io/
title
Calculator+iO — Online Calculators for Fitness, Science, Math, Finance, Health
locale
en
site name
Calculator.iO
determiner
the
description
Find the calculator you need with our extensive collection of free online calculators! We've got you covered from finance to math, health to physics. Try it now!
locale:alternate
vi

Technology

CDN
Cloudflare
Analytics
  • Google Tag Manager
Ads
  • Google AdSense

Third-party hosts loaded (2)

  • pagead2.googlesyndication.com×1
  • www.googletagmanager.com×1

Social

DNS records live

NS
  • maria.ns.cloudflare.com
  • miles.ns.cloudflare.com
MX
  • 12 route1.mx.cloudflare.net
  • 38 route2.mx.cloudflare.net
  • 78 route3.mx.cloudflare.net
TXT
  • hosting-site=calculator-io-db8f2
Verified for
  • Google

Email authentication strong

SPF
v=spf1 a mx include:_spf.google.com include:_spf.mx.cloudflare.net ~all
softfail (~all)
DMARC
v=DMARC1; p=none; aspf=r; adkim=s; rua=mailto:ff87c0530bd14fad99230d86c6b85f8c@dmarc-reports.cloudflare.net
policy: none (monitoring only)
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-03-12 to 2026-06-10
Expires in 21 days

HTTP security headers

Header hygiene 50/100 Checked live page: https://www.calculator.io/

present
  • strict-transport-security
findings
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
strict-transport-security
max-age=31556926

Links to (4)

Linked from (26)