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.

Back to Search

vietnamairlines.com

https://vietnamairlines.com· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

vietnamairlines.com

Sponsored

Hosting Provider

Akamai Technologies

IP Address

2.16.6.13

Server Location

🇳🇱 Amsterdam, Netherlands

ASN

AS20940

CDN

Fastly

Nameservers

a28-67.akam.net.ns1.pavietnam.vn.a5-64.akam.net.a1-17.akam.net.+5 more

Performance

Page Speed

3 MB

185 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

CMS

Adobe Experience Manager

Infrastructure

Hosting

Akamai Technologies

CDN

Fastly

Technology Stack

10 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel PostHog

CSS Frameworks

Frameworks

Libraries

Tag Managers

Advertising

SEO Analysis

D58/100

vietnamairlines.comvietnamairlines.com

Vietnam Airlines | Reach Further | Official website

No description available for this page.

Title Length51 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

39 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

55%Poor

Critical / Transactional

HTTPS

No WAF

16d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

08.03.2025

Valid Until

08.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

vietnamairlines.comwww.vietnamairlines.com

SHA-256 Fingerprint

0F:B3:D7:84:42:2A:57:1B:8F:0A:20:5D:57:4C:DB:07:45:D4:36:0E...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

akamai-cache-status

NotCacheable from child

akamai-grn

0.ced5ce17.1771592368.276e8c36

cache-control

🔴 No Cache(max-age=0, no-cache, no-store)

content-encoding

⚡ Brotli(br)

content-security-policy

frame-ancestors 'self' *.vietnamairlines.com

content-type

text/html;charset=utf-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

mail01.vietnamairlines.com

mail03.vietnamairlines.com

mail02.vietnamairlines.com

vietnamairlines-com.mail.protection.outlook.com

+1 more

Domain Information

vietnamairlines.com

Domain Age

26y 9m

Created

21.05.1999

Expires

21.05.2028

Last Updated

14.05.2025

Registrar

P.A. Viet Nam Company Limited

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

Open Sans

80/100

Readability

/30

32/40

14px · LH 1.57

Hierarchy

/20

25/25

3.43x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Sans48px

Body Font

Open Sans

Sans14px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

48px

28px

20px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.57 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.4x larger than body text.

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

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

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

Buy on MyFonts

Business & Marketing Stack

7 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(5)local(4)static.contineljs.com(2)static.amcdn.vn(2)connect.facebook.net(2)

Website Identity

Facebook X (Twitter)Instagram YouTube TikTok

Sponsored

Last analyzed: 20 Feb 2026 at 13:00

Historical Analysis & Change Tracking