duba.net

https://duba.net· First analyzed 30 Apr 2026· Updated 30 Apr 2026

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duba.net

Mobile

Sponsored

Hosting Provider

China Unicom

IP Address

221.194.141.163

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Shijiazhuang, China

ASN

AS4837

Server

OpenResty

Performance

Core Web Vitals

Weight

First Contentful Paint

2.8 s10%

Speed Index

3.6 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

9 KB

32 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Nuxt.js

Infrastructure

Hosting

China Unicom

Technology Stack

4 Technologies Detected

Meta Frameworks

CSS Frameworks

Fonts

Web Servers

SEO Analysis

D48/100

Meta Tags10/15

Content5/12

Headings3/8

Technical13/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile3/4

Indexability3/3

duba.netduba.net

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Title Length39 chars

Recommended: 50-60 chars (~230px / 580px)

Description Length88 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (9/12) — critical for accessibility and SEO

13 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

3 URLs

robots.txt

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

F26/100

Bot Access

20/25

Machine Read.

3/25

Schema Data

0/25

Citation

3/25

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:1%

Words:74

Token eff.:Too Short

Sections/1K:50

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.4w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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.

54/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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...

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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.

62/100

A+

1 mg

CO₂e / view

8.8 KB

Page Weight

95%

Cleaner Than

New Visitor

1 mg

Returning (cached)

<0.001 g

Annual (10K/mo)

132 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

<0.001 g

Resource Breakdown

HTML

8.8 KB

Green Hosting Not Verified

China Unicom

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

102d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

10.07.2025

Valid Until

11.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

*.duba.netwww.duba.netduba.net

SHA-256 Fingerprint

E1:AA:10:36:63:66:D6:8E:94:84:93:2B:2C:9D:9F:B4:77:D6:A8:54...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

1512

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-length

8668

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

duba.net

Domain Age

24y 1m

Created

20.03.2002

Expires

20.03.2029

Last Updated

20.11.2025

Registrar

eName Technology Co., Ltd.

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.

62/100

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

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

-apple-system

WCAG Partial

55/100

Readability

/30

13/30

12px · LH 1.50

Hierarchy

/20

7/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

21/25

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans12px

Contrast Ratio

1:1

26 issues

Reading Comfort

~94 CPL

Wide lines

16px

30px

12px

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

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

⚠️ Wide lines: ~94 chars/line. Use max-width: 65ch for comfortable reading.

⚠️ Partial contrast: 26 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.

Color Palette

6 unique colors

Light

#ffffff

Background· 17.000000000000004%

#0849ed

Primary· 72.89999999999999%

#2c7fe4

Accent· 4.4%

#94b0e8

Accent· 4.3%

#fff9df

Accent· 0.7%

#95e0c8

Accent· 0.7%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

new.duba.net(6)hm.baidu.com(1)fe-res.zhhainiao.com(1)

Website Identity

duba.net

24 years old

Location detected: 🇨🇳 Chinavia ip

eName Technology Co., Ltd.zh-CN

Sponsored

Last analyzed: 30 Apr 2026 at 20:13

Historical Analysis & Change Tracking