cb.vu

https://cb.vu· First analyzed 29 May 2026· Updated 29 May 2026

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cb.vu

Mobile

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Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.21.14.156

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

teresa.ns.cloudflare.com.greg.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

532 ms10%

Speed Index

692 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

9 KB

6 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

4 Technologies Detected

Analytics

Matomo Clicky

CSS Frameworks

Tailwind CSS

CDN

Cloudflare

SEO Analysis

C67/100

Meta Tags13/15

Content12/12

Headings3/8

Technical20/25

E-E-A-T0/7

Images0/7

Links5/5

URL5/5

Social5/5

Freshness0/4

Mobile1/4

Indexability3/3

cb.vucb.vu

CB.VU - Linux, Unix & Webmaster Authority

CB.VU is the go-to resource for Linux system administration, Unix commands, networking, security, DevOps, shell scripting, and web server management. Home of...

Description truncated.

Title Length41 chars

Recommended: 50-60 chars (~248px / 580px)

Description Length175 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

83 URLs

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

7/100

Poor

2 14 1

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

Sponsored

AI & LLM Readiness

D47/100

Bot Access

20/25

Machine Read.

11/25

Schema Data

3/25

Citation

13/25

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

nav

Text ratio:20%

Words:513

Token eff.:Optimal

Sections/1K:35.1

Depth:1/5

Structured Data

1 JSON-LD

WebSiteSearchAction

Citation Readiness

Opening Summary16w

Descriptive Headingsavg 3.6w

Canonical URL

Open Graph2/3

Twitter Card3/3

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.

71/100

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

10/15

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.

3 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.

66/100

A+

<0.001 g

CO₂e / view

9.3 KB

Page Weight

95%

Cleaner Than

New Visitor

1 mg

Returning (cached)

<0.001 g

Annual (10K/mo)

108 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

<0.001 g

Resource Breakdown

CSS

3.6 KB

HTML

5.7 KB

Green Hosting Verified

Cloudflare

GWF Verified

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

26%Critical

Interactive

HTTPS

WAF

62d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

01.05.2026

Valid Until

30.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

cb.vu*.cb.vu

SHA-256 Fingerprint

90:1C:45:D2:8B:DB:00:84:DF:AD:B5:3B:33:24:A9:89:1E:6F:81:DB...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cf-cache-status

DYNAMIC

cf-ray🇺🇸 Washington DC

a032bdb47e663ad5-IAD

content-encoding

zstd

content-type

text/html; charset=utf-8

date

Fri, 29 May 2026 04:26:27 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.cb.vu

Domain Information

cb.vu

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.

60/100

Mobile Friendly

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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Segoe UI

WCAG Partial

63/100

Readability

/30

16/30

14px · LH 1.50

Hierarchy

/20

8/20

WCAG

/25

19/25

1:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Segoe UI

Sans

Body Font

Segoe UI

Sans14px

Contrast Ratio

1:1

2 issues

Reading Comfort

~40 CPL

Narrow lines

26px

18px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 20/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

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

Flesch 21

Color Palette

4 unique colors

Dark

#000000

Background· 55.099999999999994%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

User behavior and product analytics

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

tracking.cb.vu(1)static.getclicky.com(1)static.cloudflareinsights.com(1)

Website Identity

CB.VU

Authority resource for Linux system administration, Unix, networking, security, DevOps, and web development.

Location detected: 🇨🇦 Canadavia ip

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Last analyzed: 29 May 2026 at 04:26

Historical Analysis & Change Tracking