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centennialbulb.org

https://centennialbulb.org· First analyzed 08 May 2026· Updated 08 May 2026
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centennialbulb.org
Desktop screenshot of centennialbulb.org
Mobile screenshot of centennialbulb.org
Mobile

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Hosting Provider

GoDaddy
godaddy.com

IP Address

132.148.115.124

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Tempe, United States

ASN

AS398101

Organization

GoDaddy.com, LLC

Server

Apache

Nameservers

ns47.domaincontrol.com.ns48.domaincontrol.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
645 ms10%
Speed Index
838 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
778 KB
27 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
SmugMug

Technology Stack

1 Technologies Detected

Web Servers

1
Apache

SEO Analysis

D54/100
13
9
2
Meta Tags10/15
Content12/12
Headings8/8
Technical6/21
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
C
centennialbulb.orgcentennialbulb.org

Livermore's Centennial Light Bulb

You have found Livermore California's World famous Centennial Light Bulb! Feel free to read the facts sheet, take a close-up look at bulb photos, tour S...

Description truncated.
Title Length33 chars

Recommended: 50-60 chars (~194px / 580px)

Description Length327 chars

Recommended: 120-160 chars

Issues (2)

  • • Most images missing alt text (25/28) — critical for accessibility and SEO
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

11 issues found

Upgrade to view details

Local SEO

Local Search Readiness

9/100
Poor
4 13 2

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

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AI & LLM Readiness

F38/100
Bot Access
20/25
Machine Read.
11/25
Schema Data
0/25
Citation
7/25

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:21%
Words:1,346
Token eff.:Optimal
Sections/1K:11.9

Structured Data

No Schema

Citation Readiness

Opening Summary21w
Descriptive Headingsavg 6.2w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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.
D
51/100
7
Passed
7
Critical
0
Warnings
Images & Alt Text
2/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
9/20
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.
3 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.
46/100
B
96 mg
CO₂e / view
777.6 KB
Page Weight
80%
Cleaner Than
New Visitor
110 mg
vs
Returning (cached)
55 mg
Annual (10K/mo)
11.5 kg
Emission Segments
Data Center
22 mg
Network
23 mg
Device
52 mg
Resource Breakdown
JavaScript
703 B
Images
634.3 KB
CSS
132.2 KB
HTML
10.4 KB
Green Hosting Not Verified
GoDaddy
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

76d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

24.04.2026

Valid Until

23.07.2026

Subject Alternative Names (5)

centennialbulb.orgcpanel.centennialbulb.orgmail.centennialbulb.orgwebdisk.centennialbulb.orgwww.centennialbulb.org

SHA-256 Fingerprint

AE:53:49:3D:0E:20:50:CD:D4:10:20:11:B2:23:CB:A8:F3:42:43:50...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges
bytes
content-encoding
📦 Gzip(gzip)
content-length
10379
content-type
text/html
date
Fri, 08 May 2026 18:49:24 GMT
etag
"da1ce8-9357-63d22f230ac8a-gzip"
Good Warning Issue

Email Infrastructure

GoDaddy Email

Score

20

SPF
DKIM
DMARC

MX Records (2)

smtp.secureserver.net
mailstore1.secureserver.net

Domain Information

centennialbulb.org

Domain Age
25y 1m

Created

29.03.2001

Expires

29.03.2027

Last Updated

24.04.2026

Registrar

GoDaddy.com, LLC

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.
F
34/100
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.
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Arial

WCAG Fail
66/100
Readability
/30
17/30

13px · LH --

Hierarchy
/20
17/20

1.69x ratio · ✓ H1→H6

WCAG
/25
12/25

1:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

Arial

Sans22px

Body Font

Arial

Sans13px

Contrast Ratio

1:1

46 issues

Reading Comfort

~51 CPL

Optimal (45–75)
22px
h1
24px
h2
19px
h3
16px
h4
13px
p

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

✅ Optimal line length: ~51 chars/line (ideal 45–75 CPL).

✅ Easy to read: Flesch score 70/100 — accessible to general audiences.

❌ Low contrast: 46 elements fail WCAG AA (min 1.0:1). Increase text/background contrast.

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

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 70

Color Palette

4 unique colors
Light
#f5f7ec
Primary· 71.89999999999998%
#8d8471
Secondary· 12.3%
#1c1715
Secondary· 10.9%
#e3e2d2
Secondary· 4.8%

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

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Scripts & Styles

4 Resources

2
Scripts
2
Styles
0
Async
0
Defer

Top Script Sources

translate.google.com(1)css(1)

Website Identity

centennialbulb.org

centennialbulb@hotmail.com
25 years old
Location detected: 🇺🇸 United Statesvia ip
GoDaddy.com, LLC📧 GoDaddy Email

Social Profiles

Facebook

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Last analyzed: 08 May 2026 at 18:49

Historical Analysis & Change Tracking