mersenne.org
Great Internet Mersenne Prime Search - PrimeNet
Last scanned Jul 26, 2026, 11:19 AM
Overall score
Great
Summary
Great Internet Mersenne Prime Search - Finding world record primes since 1996. This website uses PHP hosted on OPTICFUSION - Isomedia, Inc., US. SEO is good (80/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
Great Internet Mersenne Prime Search - Finding world record primes since 1996. GIMPS is an organized search for Mersenne prime numbers using provided free software.
- United States
- Hosted on OPTICFUSION - Isomedia, Inc., US
Top issues to fix
7 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.
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.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
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.
+1 more issue — details in the sections below.
SEO
3 issue(s) found
Performance
555 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Great Internet Mersenne Prime Search - Finding world record primes since 1996. GIMPS is an organized search for Mersenne prime numbers using provided free software.
Meta tags
- Title
- Great Internet Mersenne Prime Search - PrimeNet
- Description
- Great Internet Mersenne Prime Search - Finding world record primes since 1996. GIMPS is an organized search for Mersenne prime numbers using provided free software.
- Canonical
- https://www.mersenne.org/
- Language
- en
- Charset
- utf-8
- Viewport
- width=1000
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- OPTICFUSION - Isomedia, Inc., US
- CDN provider
- —
- IP address
- 209.147.127.187
- ASN
- AS30170 (OPTICFUSION - Isomedia, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME |
|
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- GoGetSSL
- Subject
- www.mersenne.org
- Valid from
- Apr 30, 2026
- Valid to
- Nov 14, 2026
- Days until expiry
- 109
- SAN domains
- www.mersenne.org, mersenne.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 10 · H3 3
Links
56 internal · 19 external · 0 broken
Images
6 total · 0 missing alt
Scripts / Styles
7 scripts · 2 stylesheets
JS / CSS size
110 KB · 24.2 KB
Page size
29.2 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 45
- sitemap.xml
- Found
- URLs in sitemap
- 26
SEO issues
- Meta description longer than 160 characters
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://mersenne.org
- Final URL
- https://www.mersenne.org/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 555 ms
- HTML size
- 29.2 KB
- Redirect chain
- https://mersenne.org → https://www.mersenne.org/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does mersenne.org use?
- mersenne.org is built with PHP, jQuery, Google Analytics.
- Is mersenne.org secure (HTTPS)?
- Yes. mersenne.org uses TLS 1.3 with a certificate issued by GoGetSSL, valid until Nov 14, 2026.
- Who hosts mersenne.org?
- mersenne.org is hosted on OPTICFUSION - Isomedia, Inc., US.
- What is mersenne.org's SEO score?
- mersenne.org scored 80/100 for SEO in the latest analysis (great).
- What is mersenne.org's overall website score?
- mersenne.org has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card