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

fnal.gov

https://fnal.gov· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

fnal.gov

Sponsored

Hosting Provider

Fermi National Accelerator Laboratory (Fermilab)

IP Address

131.225.105.119

Server Location

🇺🇸 Aurora, United States

ASN

AS3152

Organization

Fermi National Accelerator Laboratory (Fermilab)

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

adns1.es.net.adns2.es.net.ns1.fnal.gov.ns2.fnal.gov.

Performance

Page Speed

9.6 MB

73 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Fermi National Accelerator Laboratory (Fermilab)

CDN

Cloudflare

Technology Stack

12 Technologies Detected

Analytics

CSS Frameworks

Advertising

Google Ads Google AdSense

Meta Frameworks

Libraries

Icon Libraries

Tag Managers

CDN

SEO Analysis

D52/100

fnal.govfnal.gov

Fermilab | Home

No description available for this page.

Title Length15 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

6 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

40 rules

Sponsored

Security Score

51%Poor

Interactive

HTTPS

WAF

62d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

20.01.2026

Valid Until

20.04.2026

Subject Alternative Names (1)

www.fnal.gov

SHA-256 Fingerprint

86:6E:D2:18:82:C9:EC:0C:FA:4D:E4:C1:B0:AE:68:EA:E8:DC:79:0B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 0s(private, max-age=0, must-revalidate)

cf-cache-status

DYNAMIC

cf-ray

9cf4135a8f8343da-EWR

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=iso-8859-1

date

Tue, 17 Feb 2026 08:57:09 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

fnal-gov.mail.protection.outlook.com

Domain Information

fnal.gov

Domain Age

28y 4m

Created

02.10.1997

Expires

01.09.2026

Last Updated

06.09.2025

Registrar

get.gov

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Helvetica Neue

61/100

Readability

/30

40/40

20px · LH 1.50

Hierarchy

/20

13/25

1.5x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Sans30px

Body Font

Helvetica Neue

Sans20px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

30px

38px

14px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Risky: Text appears on background images without overlay protection.

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(15)googletagmanager.com(2)pagead2.googlesyndication.com(2)static.cloudflareinsights.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube Threads

Sponsored

Last analyzed: 17 Feb 2026 at 08:57

Historical Analysis & Change Tracking