number.academy
Number academy the encyclopedia of numbers
Last scanned Aug 24, 2026, 1:21 PM
Overall score
Great
Summary
The encyclopedia of natural numbers, random number generators, Roman numbers, prime numbers etc. All about natural numbers: basic and advanced mathematics, computing, codes and images, writing and naming in other languag… This website uses Apache hosted on HETZNER-AS - Hetzner Online GmbH, DE. SEO is good (85/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
The encyclopedia of natural numbers, random number generators, Roman numbers, prime numbers etc. All about natural numbers: basic and advanced mathematics, computing, codes and images, writing and naming in other languages, interesting data (numerology, history, culture, art, philosophy, biology, physics, chemistry, metaphysics, religion, distances, heights, times, crashed planes, games, ...)
- Germany
- Hosted on HETZNER-AS - Hetzner Online GmbH, DE
Top issues to fix
6 issues found · 1 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
TLS certificate expires in 29 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
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.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
SEO
2 issue(s) found
Performance
164 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
The encyclopedia of natural numbers, random number generators, Roman numbers, prime numbers etc. All about natural numbers: basic and advanced mathematics, computing, codes and images, writing and naming in other languages, interesting data (numerology, history, culture, art, philosophy, biology, physics, chemistry, metaphysics, religion, distances, heights, times, crashed planes, games, ...)
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Number academy the encyclopedia of numbers
- Description
- The encyclopedia of natural numbers, random number generators, Roman numbers, prime numbers etc. All about natural numbers: basic and advanced mathematics, computing, codes and images, writing and naming in other languages, interesting data (numerology, history, culture, art, philosophy, biology, physics, chemistry, metaphysics, religion, distances, heights, times, crashed planes, games, ...)
- Canonical
- https://number.academy/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- HETZNER-AS - Hetzner Online GmbH, DE
- CDN provider
- —
- IP address
- 138.201.27.171
- ASN
- AS24940 (HETZNER-AS - Hetzner Online GmbH, DE)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- number.academy
- Valid from
- Jun 25, 2026
- Valid to
- Sep 23, 2026
- Days until expiry
- 29
- SAN domains
- number.academy, www.number.academy
Security headers
- Strict-Transport-SecurityEnabled
- 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 12 · H3 8
Links
108 internal · 5 external · 0 broken
Images
12 total · 0 missing alt
Scripts / Styles
20 scripts · 2 stylesheets
JS / CSS size
867 KB · 14.7 KB
Page size
33.4 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 16
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Meta description longer than 160 characters
- No structured data (JSON-LD) found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://number.academy
- Final URL
- https://number.academy
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 164 ms
- HTML size
- 33.4 KB
- Redirect chain
- https://number.academy
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Frequently asked questions
- What technology does number.academy use?
- number.academy is built with Bootstrap, jQuery, Google Analytics, Google Ads, Apache.
- Is number.academy secure (HTTPS)?
- Yes. number.academy uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 23, 2026.
- Who hosts number.academy?
- number.academy is hosted on HETZNER-AS - Hetzner Online GmbH, DE.
- What is number.academy's SEO score?
- number.academy scored 85/100 for SEO in the latest analysis (great).
- What is number.academy's overall website score?
- number.academy has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card