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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telefonica.com

https://telefonica.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

telefonica.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

141.101.90.98

Server Location

🇩🇪 Munich, Germany

ASN

AS13335

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

dns2.movistar.es.dns1.movistar.es.

Performance

Page Speed

1.5 MB

84 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Telefonica themev1.0.0

by telefonica

View Theme

Technology Stack

12 Technologies Detected

Plugins

Telefonica Blocks Telefonica Newsletter Web Stories

Libraries

Other

CSS Frameworks

Analytics

Tag Managers

Other

CDN

SEO Analysis

A88/100

telefonica.comtelefonica.com

Telefónica: compañía líder en telecomunicaciones

Telefónica, empresa multinacional de telecomunicaciones, con sede central en la ciudad de Madrid. Descubre aquí toda la información sobre nosotros.

Title Length48 chars

Recommended: 50-60 chars

Description Length147 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (22/39)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

18 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

61%Fair

Interactive

HTTPS

WAF

68d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

26.01.2026

Valid Until

26.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.telefonica.com

SHA-256 Fingerprint

47:F8:5D:23:9A:9E:3C:DC:D3:CD:01:D9:F4:61:A4:AB:D3:0A:82:2B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🟡 300s(max-age=300, must-revalidate)

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

9cf2248a5f18d3ad-FRA

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

telefonicacorp.mail.protection.outlook.com

Domain Information

telefonica.com

Domain Age

29y 9m

Created

03.05.1996

Expires

04.05.2026

Last Updated

24.03.2025

Registrar

Acens Technologies, S.L.U.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

Telefonica-sans-extralight + Telefonica-sans-regular

33/100

Readability

/30

17/40

14px · LH 2.14

Hierarchy

/20

18/25

4.14x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Telefonica-sans-extralight

Sans58px

Body Font

Telefonica-sans-regular

Sans14px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

58px

38px

18px

15px

14px

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

⚠️ Wide line spacing (2.14). Consider 1.4-1.8 for better flow.

✅ Strong hierarchy: Headlines are 4.1x larger than body text.

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

⚠️ Cramped layout: 26 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

A/B Testing & Optimization

VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

telefonica.com(16)googletagmanager.com(1)cdn.cookielaw.org(1)stats.wp.com(1)cdn.ampproject.org(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube

Sponsored

Last analyzed: 17 Feb 2026 at 03:19

Historical Analysis & Change Tracking