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calculator.io 200
🔒 SSL Valid
HTTP Status A three-digit code showing if the site loaded successfully (200), redirects (301/302), or has errors (4xx/5xx).Read more →
200
SSL Expires When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
in 52d
Domain Expires When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
N/A
Hosting The company and location where this website's server is physically located.Read more →
Unknown
Security Score based on key HTTP security headers: HSTS, Content-Security-Policy, and X-Frame-Options.Read more →
0/3
IP Address The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
172.67.72.174
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
N/A
Uptime
N/A
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
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Performance data not available yet.
Tech Stack Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools. 1
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🌐 CDN
Cloudflare
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DNS Records DNS translates domain names to IP addresses. Records control where the site, email, and services are directed.Read more →
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| A (IPv4) | 104.26.4.39172.67.72.174104.26.5.39 |
| AAAA (IPv6) | 2606:4700:20::681a:5272606:4700:20::681a:4272606:4700:20::ac43:48ae |
| NS | maria.ns.cloudflare.commiles.ns.cloudflare.com |
| MX | 12 route1.mx.cloudflare.net38 route2.mx.cloudflare.net78 route3.mx.cloudflare.net |
| TXT (2) |
Services configured via TXT:
Google
Show all TXT recordsv=spf1 a mx include:_spf.google.com include:_spf.mx.cloudflare.net ~all google-site-verification=CFYrtcCtYnF58I330gciYwsTLg5EnWrVSlVOiOtYmQQ |
WHOIS / RDAP Public registration data: who registered the domain, when, and when it expires.Read more →
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| Registrar | N/A |
| Registered | N/A |
| Expires | N/A |
| Last Updated | N/A |
SSL Certificate Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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| Subject (CN) | calculator.io |
| Issuer | Google Trust Services |
| Valid From | 2026-09-17 |
| Valid Until | 2026-12-16 (52 days left) |
| SANs (3) | calculator.iowww.calculator.io*.www.calculator.io |
HTTP Headers Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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| Status | 200 |
| Server | cloudflare |
| Content-Type | text/html |
| Final URL | https://www.calculator.io/ |
| cache-control | public, max-age=0, must-revalidate |
| cf-ray | a4fd6e9b9c4898dc-IAD |
Security headers HTTP headers that protect visitors from attacks. HSTS forces HTTPS, CSP controls resource loading, X-Frame-Options prevents clickjacking.Read more →
Hosting Physical infrastructure: where the server is, who operates it, and what network it belongs to.Read more →
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| IP Address | 172.67.72.174 |
| Provider | Unknown |
| Organization | N/A |
| ASN | N/A |
| Location | N/A |
Security Score
F (1/7)
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Sitemap & Robots
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Open to search engines
This site's robots.txt lets crawlers access its main content. Search engines can index it normally.
No paths are disallowed — everything is crawlable.
| Sitemap | Found 28 sitemaps (index) pages |
Social & Meta Tags
Complete
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| 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! |
| OG Title | Calculator.io — Online Calculators for Fitness, Science, Math, Finance, Health |
| OG 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! |
| OG Image | https://www.calculator.io/assets/images/logo/icon-og.png |
| OG Type | website |
| OG Site Name | Calculator.io |
| Twitter Card | summary |
| Canonical URL | https://www.calculator.io/ |
| Language | en |
Mail Security Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
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| SPF | ✓ Present v=spf1 a mx include:_spf.google.com include:_spf.mx.cloudflare.net ~all |
| DMARC | ✓ Present v=DMARC1; p=none; aspf=r; adkim=s; rua=mailto:[email protected] |
| MX Records | 12 → route1.mx.cloudflare.net 38 → route2.mx.cloudflare.net 78 → route3.mx.cloudflare.net |
Other TLDs Other top-level domain variants of this domain name and their availability. 22 active 1 for sale
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Uptime Monitor
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Not checked yet — data will appear after the first monitoring run.