21-sun.com

https://21-sun.com· First analyzed 02 May 2026· Updated 02 May 2026

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21-sun.com

Mobile

Sponsored

Hosting Provider

Huawei Public Cloud Service

IP Address

113.44.215.230

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Beijing, China

ASN

AS55990

Organization

Huawei Public Cloud Service

Server

OpenResty

Nameservers

dns1.hichina.com.dns2.hichina.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

3.4 s10%

Speed Index

4.5 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.7 MB

157 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Concrete CMS

Technology Stack

4 Technologies Detected

Libraries

UI Components

CSS Frameworks

Web Servers

SEO Analysis

C63/100

Meta Tags7/15

Content10/12

Headings3/8

Technical19/25

E-E-A-T5/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

21-sun.com21-sun.com

工程机械商贸网-工程机械网-工程机械-挖掘机-装载机

工程机械商贸网专业从事工程机械领域商贸服务的电子商务网站。工程机械商贸网是目前知名的工程机械门户网站，大量的企业在工程机械商贸网的辅导下完成了从企业网站制作、网上业务开展……

Title Length26 chars

Recommended: 50-60 chars (~161px / 580px)

Description Length87 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (261/504) — critical for accessibility and SEO

12 issues found

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Crawlability

Sitemap

Type: standard

37,559 URLs

robots.txt

5 rules

Sitemap reference found

Local SEO

Local Search Readiness

11/100

Poor

3 13 1

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

Sponsored

AI & LLM Readiness

F33/100

Bot Access

20/25

Machine Read.

3/25

Schema Data

2/25

Citation

8/25

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:6%

Words:5,290

Token eff.:Acceptable

Sections/1K:5.9

Structured Data

1 JSON-LD

Organization×1.1

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.3w

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...

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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.

52/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

4/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

5/15

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

9/15

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

5 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.

13/100

345 mg

CO₂e / view

2.7 MB

Page Weight

30%

Cleaner Than

New Visitor

394 mg

Returning (cached)

197 mg

Annual (10K/mo)

41.4 kg

Emission Segments

Data Center

77 mg

Network

83 mg

Device

185 mg

Resource Breakdown

JavaScript

162.4 KB

Images

1.5 MB

CSS

84.1 KB

HTML

960.6 KB

Other

655 B

Green Hosting Not Verified

Huawei Public Cloud Service

8 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

22d

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

HTTP Protocol

HTTP/1.1

Valid From

24.02.2026

Valid Until

25.05.2026

Subject Alternative Names (2)

*.21-sun.com21-sun.com

SHA-256 Fingerprint

1F:29:96:4F:C8:BB:61:61:CA:F1:25:8E:D7:11:3C:23:3C:E8:17:F9...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

3521

cache-control

🔴 No Cache(no-cache)

connection

keep-alive

content-length

983401

content-type

text/html

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (3)

mx1.qiye.aliyun.com

mx3.qiye.aliyun.com

mx2.qiye.aliyun.com

Domain Information

21-sun.com

Domain Age

25y 12m

Created

09.05.2000

Expires

09.05.2027

Last Updated

24.08.2023

Registrar

Alibaba Cloud Computing (Beijing) 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.

50/100

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,minimum-scale=1,maximum-scale=1,user-scalable=no

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Microsoft Yahei

WCAG Partial

41/100

Readability

/30

9/30

13px · LH 1.85

Hierarchy

/20

7/20

WCAG

/25

14/25

1.44:1 min contrast

Performance

/25

11/25

1 font · 6 req

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans13px

Contrast Ratio

1.44:1

22 issues

Reading Comfort

Single Font Family

left aligned

32px

23px

13px

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

⚠️ Wide line spacing (1.85). 1.4–1.6 is optimal for body text.

⚠️ Partial contrast: 22 elements below WCAG AA threshold (min 1.4:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

12 unique colors

2.01:1 Fail Light

#ffffff

Background· 38.4%

#acbab8

Secondary· 5.8%

#9e9283

Primary· 7.3%

#33363f

Text· 7.1%

#d1dddf

Secondary· 6.6%

#0c0f2f

Accent· 6.5%

#0b5ca4

Accent· 6.3%

#1f76d3

Accent· 6.2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)hm.baidu.com(1)21-sun.com(1)s6.cnzz.com(1)

Website Identity

21-sun.com

4006-603-068

25 years old

Location detected: 🇨🇳 Chinavia ip

Alibaba Cloud Computing (Beijing) Co., Ltd.

Sponsored

Last analyzed: 02 May 2026 at 21:36

Historical Analysis & Change Tracking