What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

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126.com

https://126.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

126.com

Sponsored

Hosting Provider

Chinanet GZ

IP Address

111.124.203.38

Server Location

🇨🇳 Guiyang, China

ASN

AS139203

Organization

Chinanet GZ

Server

Nginx

Nameservers

ns2.166.com.ns6.nease.net.ns3.nease.net.ns8.166.com.+3 more

Performance

Page Speed

564 KB

30 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Chinanet GZ

Progressive Web App

Service Worker

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Nginx

SEO Analysis

F35/100

126.com126.com

126网易免费邮-你的专业电子邮局

网易126免费邮箱–你的专业电子邮局，超过20年的邮箱运营经验，系统快速稳定安全，支持超大附件和网盘服务。网易邮箱官方App“邮箱大师”帮您高效处理邮件，支持所有邮箱，并可在手机、Windows和Mac上多端协同使用。

Title Length17 chars

Recommended: 50-60 chars

Description Length109 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Missing viewport meta tag - page may not be mobile-friendly

9 issues found

Upgrade to view details

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Security Score

21%Critical

Interactive

HTTPS

No WAF

365d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert, Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

20.01.2026

Valid Until

18.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.126.com126.com

SHA-256 Fingerprint

32:63:84:6F:B1:74:60:C3:02:C9:1B:15:71:85:E0:9D:6B:D2:C4:DB...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 1 Hours(max-age=3600)

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Wed, 18 Feb 2026 07:11:34 GMT

etag

W/"6915a1d6-4727"

expires

Wed, 18 Feb 2026 07:33:51 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (4)

126mx03.mxmail.netease.com

126mx01.mxmail.netease.com

126mx00.mxmail.netease.com

126mx02.mxmail.netease.com

Domain Information

126.com

Domain Age

27y 12m

Created

28.02.1998

Expires

28.02.2028

Last Updated

22.09.2023

Registrar

MarkMonitor Information Technology (Shanghai) Co., Ltd.

DNSSEC

Not Enabled

Typography & Readability

PingFangSC-Regular

54/100

Readability

/30

20/40

12px · LH 1.66

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

PingFangSC-Regular

Sans

Body Font

PingFangSC-Regular

Sans12px

Contrast Ratio

Reading Comfort

Single Font Family

center aligned

24px

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

✅ Optimal line spacing: 1.66 ratio ensures comfortable reading.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

mimg.127.net(10)urswebzj.nosdn.127.net(1)utility.mail.163.com(1)

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Last analyzed: 18 Feb 2026 at 07:12

Historical Analysis & Change Tracking