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mersenne.org

https://mersenne.org· First analyzed 27 Apr 2026· Updated 27 Apr 2026
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mersenne.org
Desktop screenshot of mersenne.org
Mobile screenshot of mersenne.org
Mobile

Sponsored

Hosting Provider

Isomedia, Inc

IP Address

209.147.127.187

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Enumclaw, United States

ASN

AS30170

Organization

Isomedia, Inc

Server

Microsoft IIS

Nameservers

ns17.domaincontrol.com.ns18.domaincontrol.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
610 ms10%
Speed Index
793 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
109 KB
28 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Isomedia, Inc

Technology Stack

7 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Libraries

1
jQueryv3.6.0

Fonts

1
Google Fonts

Advertising

1
Google Ads

Web Servers

1
Microsoft IISv10.0

Languages

1
PHPv7.4.33

SEO Analysis

B70/100
20
6
0
Meta Tags13/15
Content12/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
M
mersenne.orgmersenne.org

Great Internet Mersenne Prime Search - PrimeNet

Great Internet Mersenne Prime Search - Finding world record primes since 1996. GIMPS is an organized search for Mersenne prime numbers using provided free s...

Description truncated.
Title Length47 chars

Recommended: 50-60 chars (~296px / 580px)

Description Length165 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    26 URLs

    robots.txt

    49 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    3/100
    Poor
    1 14 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D49/100
    Bot Access
    20/25
    Machine Read.
    14/25
    Schema Data
    0/25
    Citation
    15/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    navheader/footer
    Text ratio:29%
    Words:1,752
    Token eff.:Optimal
    Sections/1K:7.4
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary58w
    Descriptive Headingsavg 6.5w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    C
    68/100
    9
    Passed
    2
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    3/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    9/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    4/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 recommendations
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    53/100
    A+
    13 mg
    CO₂e / view
    108.5 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    15 mg
    vs
    Returning (cached)
    8 mg
    Annual (10K/mo)
    1.6 kg
    Emission Segments
    Data Center
    3 mg
    Network
    3 mg
    Device
    7 mg
    Resource Breakdown
    JavaScript
    39.3 KB
    Images
    46.1 KB
    CSS
    14.0 KB
    HTML
    9.2 KB
    Green Hosting Not Verified
    Isomedia, Inc
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    No WAF

    23d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    GoGetSSL

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    19.04.2025

    Valid Until

    20.05.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    www.mersenne.orgmersenne.org

    SHA-256 Fingerprint

    B8:D5:F3:46:9E:F6:63:B8:94:5E:54:F0:00:06:C0:DD:B2:52:B1:18...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400; persist=1
    cache-control
    🔴 No Cache(no-store, no-cache, must-revalidate)
    content-encoding
    📦 Gzip(gzip)
    content-length
    9122
    content-type
    text/html; charset=utf-8
    date
    Mon, 27 Apr 2026 00:14:35 GMT
    Good Warning Issue

    Email Infrastructure

    Forward Email

    Score

    65

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (2)

    mx1.forwardemail.net
    mx2.forwardemail.net

    Domain Information

    mersenne.org

    Domain Age
    29y 5m

    Created

    03.12.1996

    Expires

    02.12.2026

    Last Updated

    07.06.2024

    Registrar

    GoDaddy.com, LLC

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    D
    48/100
    Not Mobile Friendly1 breakpoint
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=1000
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Tahoma

    WCAG Partial
    60/100
    Readability
    /30
    12/30

    13px · LH --

    Hierarchy
    /20
    18/20

    2x ratio · ✓ H1→H6

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    14/25

    1 font

    Heading Font

    Tahoma

    Sans27px

    Body Font

    Tahoma

    Sans13px

    Contrast Ratio

    1:1

    25 issues

    Reading Comfort

    ~161 CPL

    Too wide
    27px
    h1
    20px
    h2
    16px
    h3
    13px
    p

    ❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

    ❌ Very long lines: ~161 chars/line causes eye strain. Add max-width constraint.

    ⚠️ Partial contrast: 25 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 2.0x larger than body text.

    ✅ Lean font stack: 1 font families keeps load times fast.

    Buy on MyFontsFlesch 66

    Color Palette

    9 unique colors
    4.56:1 AA Light
    #ffffff
    Background· 32.1%
    #75757f
    Other· 5.9%
    #303744
    Primary· 11.3%
    #9ea8b5
    Secondary· 6.1%
    #275667
    Secondary· 5.8%
    #b8b7c5
    Secondary· 5.7%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    8 Resources

    5
    Scripts
    3
    Styles
    2
    Async
    0
    Defer

    Top Script Sources

    ajax.googleapis.com(1)local(1)googletagmanager.com(1)translate.googleapis.com(1)translate.google.com(1)

    Website Identity

    mersenne.org

    29 years old
    Location detected: 🇺🇸 United Statesvia ip
    GoDaddy.com, LLC📧 Forward Emailen

    Sponsored

    Last analyzed: 27 Apr 2026 at 00:15

    Historical Analysis & Change Tracking