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feross.org

https://feross.org· First analyzed 18 May 2026· Updated 18 May 2026
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feross.org
Desktop screenshot of feross.org
Mobile screenshot of feross.org
Mobile

Sponsored

Hosting Provider

Linode (Akamai)
linode.com

IP Address

50.116.11.184

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Fremont, United States

ASN

AS63949

Organization

Linode

Server

Nginx

Nameservers

ns4.linode.com.ns1.linode.com.ns2.linode.com.ns5.linode.com.+1 more

Performance

100

Core Web Vitals

Weight

First Contentful Paint
552 ms10%
Speed Index
718 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
434 KB
13 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Linode (Akamai)

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Fonts

1
Google Fonts

Analytics

1
Google Analytics

Web Servers

1
Nginx

SEO Analysis

B72/100
21
4
0
Meta Tags13/15
Content11/12
Headings8/8
Technical14/21
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social3/5
Freshness2/4
Mobile4/4
Indexability3/3
F
feross.orgfeross.org

Home of Feross Aboukhadijeh » Feross.org

Feross Aboukhadijeh is a computer security researcher, teacher, web developer, designer, long distance runner, gamer, music lover, and builder of websites th...

Description truncated.
Title Length40 chars

Recommended: 50-60 chars (~246px / 580px)

Description Length181 chars

Recommended: 120-160 chars

Issues (0)

    4 issues found

    Upgrade to view details

    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.
    13/25
    Schema Data
    0/25
    Citation
    16/25

    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
    Text ratio:23%
    Words:858
    Token eff.:Optimal
    Sections/1K:4.7

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary31w
    Descriptive Headingsavg 2.2w
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (7)
    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.
    B
    76/100
    10
    Passed
    2
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    16/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    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
    1/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •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.
    67/100
    A
    44 mg
    CO₂e / view
    433.6 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    50 mg
    vs
    Returning (cached)
    25 mg
    Annual (10K/mo)
    5.3 kg
    Emission Segments
    Data Center
    2 mg
    Network
    13 mg
    Device
    29 mg
    Resource Breakdown
    JavaScript
    32.1 KB
    Images
    391.0 KB
    CSS
    3.4 KB
    Fonts
    687 B
    HTML
    6.1 KB
    Other
    317 B
    Green Hosting Verified
    Linode (Akamai)
    Provider Match
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    91%Excellent
    Static / Informational

    HTTPS

    No WAF

    49d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    Valid From

    07.04.2026

    Valid Until

    06.07.2026

    Subject Alternative Names (3)

    feross.feross.orgfeross.orgwww.feross.org

    SHA-256 Fingerprint

    FA:36:97:69:9F:FA:F3:B6:8A:38:53:5E:DF:95:7A:CE:A3:E8:FA:63...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=utf-8
    date
    Mon, 18 May 2026 02:20:56 GMT
    etag
    W/"68c05ed5-540e"
    last-modified
    Tue, 09 Sep 2025 17:07:33 GMT
    server
    nginx
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    95

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (5)

    ALT1.ASPMX.L.GOOGLE.COM
    ALT3.ASPMX.L.GOOGLE.COM
    ALT2.ASPMX.L.GOOGLE.COM
    ALT4.ASPMX.L.GOOGLE.COM

    +1 more

    Domain Information

    feross.org

    Domain Age
    17y 3m

    Created

    30.01.2009

    Expires

    30.01.2033

    Last Updated

    24.08.2024

    Registrar

    NameCheap, Inc.

    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.
    C
    62/100
    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=device-width, initial-scale=1
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    -apple-system-headline + -apple-system-body

    WCAG AA
    79/100
    Readability
    /30
    25/30

    17px · LH 1.53

    Hierarchy
    /20
    17/20

    5x ratio · ✓ H1→H6

    WCAG
    /25
    21/25

    4.54:1 min contrast

    Performance
    /25
    16/25

    3 fonts · 1 req

    Heading Font

    -apple-system-headline

    Sans85px

    Body Font

    -apple-system-body

    Sans17px

    Contrast Ratio

    4.54:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~42 CPL

    Narrow lines
    85px
    h1
    27px
    h2
    17px
    p

    ✅ Excellent readability: 17px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.53 ratio (ideal range 1.4–1.6).

    ⚠️ Hard to read: Flesch score 49/100. Simplify sentences for wider reach.

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.5:1).

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

    ✅ Strong hierarchy: Headlines are 5.0x larger than body text.

    GGoogle FontsBuy on MyFontsFlesch 49

    Color Palette

    10 unique colors
    Light
    #fffefa
    Background· 80.3%
    #023eb5
    Accent· 3.5%
    #ff41b4
    Primary· 0%
    #2c88c1
    Accent· 3.2%
    #ca9f9a
    Secondary· 2.8%
    #e8d9d1
    Secondary· 2.7%
    #1b3772
    Accent· 1.8%
    #ca7871
    Secondary· 1.7%

    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

    Ad Networks

    Carbon Ads

    Sponsored

    Scripts & Styles

    5 Resources

    3
    Scripts
    2
    Styles
    2
    Async
    0
    Defer

    Top Script Sources

    cdn.carbonads.com(1)local(1)google-analytics.com(1)

    Website Identity

    feross.org

    17 years old
    Location detected: 🇺🇸 United Statesvia ip
    NameCheap, Inc.📧 Google Workspaceen

    Social Profiles

    X (Twitter)GitHub

    Sponsored

    Last analyzed: 18 May 2026 at 02:21

    Historical Analysis & Change Tracking