51test.net

https://51test.net· First analyzed 06 May 2026· Updated 06 May 2026

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51test.net

Mobile

Sponsored

Hosting Provider

Chinanet HN

IP Address

175.12.90.35

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Qingyuan, China

ASN

AS151823

Organization

Chinanet HN

Server

Nginx

Performance

Core Web Vitals

Weight

First Contentful Paint

2.3 s10%

Speed Index

3.0 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

13 KB

30 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Chinanet HN

Technology Stack

3 Technologies Detected

Libraries

jQueryv1.11.3

CSS Frameworks

Tailwind CSS

Web Servers

Nginx

SEO Analysis

D54/100

Meta Tags5/15

Content9/12

Headings5/8

Technical17/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

51test.net51test.net

无忧考网-找学习资源，上无忧考网！

无忧考网专业提供考试资讯、真题题库、作文范文、求职招聘、出国留学等最新学习资源。

Title Length17 chars

Recommended: 50-60 chars (~105px / 580px)

Description Length40 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (27/28) — critical for accessibility and SEO

10 issues found

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Crawlability

Sitemap

Type: index

316 URLs

316 sub-sitemaps

robots.txt

3 rules

Local SEO

Local Search Readiness

6/100

Poor

2 13 2

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

Sponsored

AI & LLM Readiness

F30/100

Bot Access

20/25

Machine Read.

3/25

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

nav

Text ratio:7%

Words:270

Token eff.:Too Short

Sections/1K:3.7

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 2w

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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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.

53/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

11/20

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

3/15

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.

55/100

A+

2 mg

CO₂e / view

12.6 KB

Page Weight

95%

Cleaner Than

New Visitor

2 mg

Returning (cached)

<0.001 g

Annual (10K/mo)

192 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

<0.001 g

Resource Breakdown

JavaScript

1.5 KB

CSS

5.8 KB

HTML

5.2 KB

Green Hosting Not Verified

Chinanet HN

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

269d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

19.02.2026

Valid Until

30.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.51test.net51test.net

SHA-256 Fingerprint

A1:16:D4:58:F5:95:FC:E8:9B:1F:31:AC:0B:6C:40:EC:2B:CF:0F:68...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

246796

cache-control

🟡 23 Hours(public, max-age=85151)

cdn-user-ip

5.182.198.11

content-encoding

⚡ Brotli(br)

content-md5

aefx/8VfIldT+qY4aVGq/w==

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

51test.net

Domain Age

24y 5m

Created

10.12.2001

Expires

10.12.2032

Last Updated

31.03.2026

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

47/100

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.

Viewport

width=device-width, initial-scale=1.0,user-scalable=no

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Microsoft YaHei + Times New Roman

WCAG AAA

73/100

Readability

/30

24/30

16px · LH 1.50

Hierarchy

/20

14/20

2.25x ratio

WCAG

/25

21/25

12.63:1 min contrast

Performance

/25

14/25

2 fonts

Heading Font

Microsoft YaHei

Sans36px

Body Font

Times New Roman

Serif16px

Contrast Ratio

12.63:1

WCAG AAA (≥7:1)

Reading Comfort

Sans Headlines + Serif Body

center aligned

36px

32px

20px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

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

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 12.6:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

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

Buy on MyFonts

Color Palette

4 unique colors

Light

#ffffff

Background· 45%

#4396e4

Primary· 45.900000000000006%

#cbdce7

Secondary· 5.9%

#6aa0d0

Accent· 3.4%

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Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

js.wykw.com(2)hm.baidu.com(1)apps.bdimg.com(1)local(1)

Website Identity

51test.net

24 years old

Location detected: 🇨🇳 Chinavia ip

Alibaba Cloud Computing (Beijing) Co., Ltd.zh-cn

Sponsored

Last analyzed: 06 May 2026 at 07:58

Historical Analysis & Change Tracking