911digitalarchive.org

https://911digitalarchive.org· First analyzed 22 May 2026· Updated 22 May 2026

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Hosting Provider

George Mason University

IP Address

129.174.134.77

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Fairfax, United States

ASN

AS11279

Organization

George Mason University

Server

Apache

Nameservers

ns2.rrchnm.org.ns1.rrchnm.org.ns3.rrchnm.org.

Performance

Core Web Vitals

Weight

First Contentful Paint

873 ms10%

Speed Index

1.1 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

418 KB

32 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

George Mason University

Technology Stack

4 Technologies Detected

Libraries

Analytics

Web Servers

SEO Analysis

D52/100

Meta Tags7/15

Content9/12

Headings3/8

Technical12/25

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

911digitalarchive.org911digitalarchive.org

Home · September 11 Digital Archive

No description available for this page.

Title Length35 chars

Recommended: 50-60 chars (~209px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1

10 issues found

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Crawlability

Sitemap

robots.txt

3 rules

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

F36/100

Bot Access

20/25

Machine Read.

5/25

Schema Data

0/25

Citation

11/25

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:11%

Words:253

Token eff.:Too Short

Sections/1K:15.8

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary83w

Descriptive Headingsavg 3.5w

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...

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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.

78/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

13/20

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

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•Accessibility recommendation preview...

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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.

48/100

52 mg

CO₂e / view

417.5 KB

Page Weight

90%

Cleaner Than

New Visitor

59 mg

Returning (cached)

30 mg

Annual (10K/mo)

6.2 kg

Emission Segments

Data Center

12 mg

Network

12 mg

Device

28 mg

Resource Breakdown

JavaScript

143.6 KB

Images

229.1 KB

CSS

40.7 KB

HTML

4.2 KB

Green Hosting Not Verified

George Mason University

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

83d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

16.05.2026

Valid Until

14.08.2026

Subject Alternative Names (10)

911.chnm.org911digitalarchive.com911digitalarchive.net911digitalarchive.orgseptember11digitalarchive.orgwww.911.chnm.orgwww.911digitalarchive.comwww.911digitalarchive.net+2 more

SHA-256 Fingerprint

B3:20:34:1F:6D:FB:45:D1:75:28:1C:5E:C5:88:99:BF:51:09:EE:32...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Fri, 22 May 2026 16:16:35 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

Domain Information

911digitalarchive.org

Domain Age

24y 6m

Created

27.11.2001

Expires

27.11.2026

Last Updated

02.11.2025

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

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.

52/100

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=1.0

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

PT Serif + Helvetica

WCAG Partial

60/100

Readability

/30

22/30

15px · LH 1.67

Hierarchy

/20

8/20

WCAG

/25

14/25

2.22:1 min contrast

Performance

/25

16/25

2 fonts

Heading Font

PT Serif

Serif

Body Font

Helvetica

Sans15px

Contrast Ratio

2.22:1

13 issues

Reading Comfort

~46 CPL

Optimal (45–75)

25px

18px

15px

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line length: ~46 chars/line (ideal 45–75 CPL).

⚠️ Hard to read: Flesch score 34/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 2.2:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Lean font stack: 2 font families keeps load times fast.

Buy on MyFontsFlesch 34

Color Palette

7 unique colors

6.08:1 AA Light

#ffffff

Background· 25.4%

#616171

Secondary· 4.2%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)ajax.googleapis.com(2)stats.rrchnm.org(1)chnmdev.gmu.edu(1)americanhistory.si.edu(1)

Website Identity

911digitalarchive.org

24 years old

Location detected: 🇺🇸 United Statesvia ip

NameCheap, Inc.en-US

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Last analyzed: 22 May 2026 at 16:17

Historical Analysis & Change Tracking