51.com

https://51.com· First analyzed 26 Apr 2026· Updated 26 Apr 2026

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51.com

Mobile

Sponsored

Hosting Provider

CNC Group CHINA169 Shandong Province Network

IP Address

119.167.249.58

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Jinan, China

ASN

AS4837

Server

OpenResty

Performance

Core Web Vitals

Weight

First Contentful Paint

2.6 s10%

Speed Index

3.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

551 KB

105 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

CNC Group CHINA169 Shandong Province Network

Technology Stack

5 Technologies Detected

Libraries

UI Components

CSS Frameworks

Web Servers

SEO Analysis

D50/100

Meta Tags14/15

Content9/12

Headings1/8

Technical8/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile1/4

Indexability3/3

51.com51.com

五一网|51游戏_好玩的游戏社区化平台_51游戏官网|51页游|空间尽在51.com

玩游戏,上51.COM。51游戏平台是国内知名的专业游戏社区化平台,在这里玩家们可以尽情体验畅玩游戏、讨论游戏、共创游戏的快乐。创立20多年来，51游戏已集游戏研发、游戏运营为一体,不断为玩家提供高品质、好玩的游戏产品,为玩家提供真诚的服务。

Title Length42 chars

Recommended: 50-60 chars (~245px / 580px)

Description Length121 chars

Recommended: 120-160 chars

Issues (3)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (59/73) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

12 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

12 rules

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

F34/100

Bot Access

20/25

Machine Read.

7/25

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

Text ratio:2%

Words:482

Token eff.:Optimal

Sections/1K:12.4

Structured Data

No Schema

Citation Readiness

Opening Summary64w

Descriptive Headingsavg 1w

Canonical URL

Open Graph3/3

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.

38/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

4/20

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

2/15

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.

47/100

68 mg

CO₂e / view

551.4 KB

Page Weight

80%

Cleaner Than

New Visitor

78 mg

Returning (cached)

39 mg

Annual (10K/mo)

8.2 kg

Emission Segments

Data Center

15 mg

Network

16 mg

Device

37 mg

Resource Breakdown

Images

532.4 KB

HTML

19.0 KB

Green Hosting Not Verified

CNC Group CHINA169 Shandong Province Network

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

257d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

09.12.2025

Valid Until

08.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.51.com51.com

SHA-256 Fingerprint

ED:6D:4A:37:5D:84:EB:C0:A2:DB:B2:AC:86:BE:F7:E5:DE:A5:6F:EA...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

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

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Sun, 26 Apr 2026 20:35:06 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

51.com

Domain Age

27y 9m

Created

10.07.1998

Expires

09.07.2028

Last Updated

05.06.2024

Registrar

Xin Net Technology Corporation

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.

31/100

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

Microsoft Yahei

WCAG Partial

48/100

Readability

/30

15/30

14px · LH 1.50

Hierarchy

/20

5/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans14px

Contrast Ratio

1:1

15 issues

Reading Comfort

~156 CPL

Too wide

16px

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 long lines: ~156 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 1.0:1).

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

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

Buy on MyFonts

Color Palette

15 unique colors

5.17:1 AA Light

#ffffff

Background· 15.399999999999999%

#74697e

Secondary· 6.2%

#f6f4ea

Primary· 8.8%

#393044

Secondary· 8.6%

#c8685c

Secondary· 6.8%

#381d26

Secondary· 6.2%

#7e96b6

Secondary· 6.2%

#7b3039

Secondary· 5.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.51img1.com(6)cdn3.51img1.com(5)zz.bdstatic.com(1)hm.baidu.com(1)

Website Identity

51.com

27 years old

Location detected: 🇨🇳 Chinavia ip

Xin Net Technology Corporation

Sponsored

Last analyzed: 26 Apr 2026 at 20:35

Historical Analysis & Change Tracking