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?

Hosting provider information for cut-the-knot.org is not available yet.

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.

Has cut-the-knot.org's score changed over time?

cut-the-knot.org's overall score has stayed steady at 79/100 since Jul 27, 2026.

cut-the-knot.org

Interactive Mathematics Miscellany <br>and Puzzles

Last scanned Aug 4, 2026, 9:00 AM · 9 views

Overall score

Fair

Summary

An encyclopedic collection of math resources for all grades. This website uses Apache. 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

Top issues to fix

10 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <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

100

Performance

351 ms

Security

HTTPS & header checks

Accessibility

3 issue(s) found

Score history

0 overall since Jul 27, 2026

Overall: 79
SEO: 80
Security: 65
Performance: 100
Accessibility: 70

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

X (Twitter)Facebook

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.

Bootstrap jQuery Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: 107.180.50.227
ASN: AS26496 ()

DNS records

Type	Value
A	107.180.50.227
AAAA	—
MX	—
TXT	—
NS	ns10.gcd-dns.com ns09.gcd-dns.com
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: 101
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

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: 351 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?: Hosting provider information for cut-the-knot.org is not available yet.
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.
Has cut-the-knot.org's score changed over time?: cut-the-knot.org's overall score has stayed steady at 79/100 since Jul 27, 2026.

Top issues to fix

Score history

Organization

Meta tags

OpenGraph & Twitter Card

Technologies

Hosting & CDN

DNS records

TLS / SSL certificate

Security headers

Content & assets

Robots.txt & Sitemap

SEO issues

Accessibility issues

Scan details

Related websites

Frequently asked questions