cut-the-knot.org
Interactive Mathematics Miscellany <br>and Puzzles
Last scanned Jul 27, 2026, 10:43 AM · 1 view
Overall score
Fair
Summary
An encyclopedic collection of math resources for all grades. This website uses Apache hosted on GO-DADDY-COM-LLC - GoDaddy.com, LLC, US. SEO is good (80/100) and accessibility is fair (70/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.
An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles
- United States
- Hosted on GO-DADDY-COM-LLC - GoDaddy.com, LLC, US
Top issues to fix
10 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+4 more issues — details in the sections below.
SEO
3 issue(s) found
Performance
381 ms
Security
HTTPS & header checks
Accessibility
3 issue(s) found
Organization
Company details published in this site's own structured data.
An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Interactive Mathematics Miscellany <br>and Puzzles
- Description
- An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles
- Canonical
- Language
- Charset
- Viewport
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- GO-DADDY-COM-LLC - GoDaddy.com, LLC, US
- CDN provider
- —
- IP address
- 107.180.50.227
- ASN
- AS400754 (GO-DADDY-COM-LLC - GoDaddy.com, LLC, US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX | — |
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- GoDaddy.com, Inc.
- Subject
- cut-the-knot.org
- Valid from
- Oct 12, 2025
- Valid to
- Nov 13, 2026
- Days until expiry
- 109
- SAN domains
- cut-the-knot.org, www.cut-the-knot.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 0 · H3 0
Links
240 internal · 4 external · 0 broken
Images
8 total · 2 missing alt
Scripts / Styles
9 scripts · 2 stylesheets
JS / CSS size
256 KB · 102 KB
Page size
39.2 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 18
- sitemap.xml
- Found
- URLs in sitemap
- 7184
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
- More than 20% of images are missing alt text
- Missing <html lang> attribute
- Missing viewport meta tag
Scan details
- Requested URL
- https://cut-the-knot.org
- Final URL
- https://cut-the-knot.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 381 ms
- HTML size
- 39.2 KB
- Redirect chain
- https://cut-the-knot.org
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Frequently asked questions
- What technology does cut-the-knot.org use?
- cut-the-knot.org is built with Bootstrap, jQuery, Apache.
- Is cut-the-knot.org secure (HTTPS)?
- Yes. cut-the-knot.org uses TLS 1.2 with a certificate issued by GoDaddy.com, Inc., valid until Nov 13, 2026.
- Who hosts cut-the-knot.org?
- cut-the-knot.org is hosted on GO-DADDY-COM-LLC - GoDaddy.com, LLC, US.
- What is cut-the-knot.org's SEO score?
- cut-the-knot.org scored 80/100 for SEO in the latest analysis (great).
- What is cut-the-knot.org's overall website score?
- cut-the-knot.org has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card