51.net

https://51.net· First analyzed 30 Apr 2026· Updated 30 Apr 2026

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51.net

Mobile

Sponsored

Hosting Provider

Huawei Cloud Service

IP Address

117.78.50.71

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Beijing, China

ASN

AS55990

Organization

Huawei Cloud Service

Server

Nginx

Nameservers

dns2.51.net.dns1.51.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

741 ms10%

Speed Index

963 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

324 KB

88 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Huawei Cloud Service

Technology Stack

1 Technologies Detected

Web Servers

Nginx

SEO Analysis

D43/100

Meta Tags11/15

Content11/12

Headings0/8

Technical6/21

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

51.net51.net

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Title Length34 chars

Recommended: 50-60 chars (~204px / 580px)

Description Length102 chars

Recommended: 120-160 chars

Issues (3)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (82/86) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

13 issues found

Upgrade to view details

Local SEO

Local Search Readiness

2/100

Poor

1 15 2

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

Sponsored

AI & LLM Readiness

F34/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

4/25

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:7%

Words:701

Token eff.:Optimal

Sections/1K:1.4

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

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.

40/100

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

3/15

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

5/15

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.

4 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.

48/100

A+

40 mg

CO₂e / view

323.6 KB

Page Weight

90%

Cleaner Than

New Visitor

46 mg

Returning (cached)

23 mg

Annual (10K/mo)

4.8 kg

Emission Segments

Data Center

9 mg

Network

10 mg

Device

22 mg

Resource Breakdown

JavaScript

8.7 KB

Images

243.3 KB

CSS

53.6 KB

HTML

18.1 KB

Green Hosting Not Verified

Huawei Cloud Service

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

149d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.09.2025

Valid Until

26.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.51.net51.net

SHA-256 Fingerprint

53:15:1D:DD:34:5A:66:F3:B0:2E:BB:22:A1:A5:80:DE:BA:FA:76:7D...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-length

18209

content-type

text/html; charset=UTF-8

date

Thu, 30 Apr 2026 23:35:57 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mxbiz2.qq.com

mxbiz1.qq.com

Domain Information

51.net

Domain Age

28y 6m

Created

04.11.1997

Expires

29.12.2028

Last Updated

12.02.2026

Registrar

Bizcn.com, Inc.

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.

26/100

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

宋体

WCAG Partial

59/100

Readability

/30

21/30

14px · LH 1.57

Hierarchy

/20

10/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

14/25

1 font

Heading Font

宋体

Body Font

宋体

Sans14px

Contrast Ratio

1:1

26 issues

Reading Comfort

Single Family

left aligned

14px

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

✅ Optimal line spacing: 1.57 ratio (ideal range 1.4–1.6).

✅ Easy to read: Flesch score 94/100 — accessible to general audiences.

⚠️ Partial contrast: 26 elements below WCAG AA threshold (min 1.0:1).

✅ 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 MyFontsFlesch 94

Color Palette

8 unique colors

Light

#f0f0f0

Background· 40.8%

#bab59a

Primary· 8.8%

#ad615f

Secondary· 7.5%

#e6f69a

Accent· 3%

#c9dea8

Secondary· 2.1%

#eee2a8

Accent· 1.4%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)kxlogo.knet.cn(1)hm.baidu.com(1)

Website Identity

51.net

28 years old

Location detected: 🇨🇳 Chinavia ip

Bizcn.com, Inc.

Sponsored

Last analyzed: 30 Apr 2026 at 23:36

Historical Analysis & Change Tracking