URL Inspection: https://geoffreychallen.com

Open Cached · just now

UP

HTTP Status

200

Ping

1 ms

Technologies

11

Technologies Detected

Infrastructure & Network (3)

CDN	Cloudflare CDN https://www.cloudflare.com
Evidence: • Header Cf-Ray: 9a488a53687c1853-IAD • Header Server: cloudflare

CDN	jsDelivr https://www.jsdelivr.com
Evidence: • HTML <script>: https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js • HTML <link>: https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css

DNS Provider	Cloudflare DNS https://www.cloudflare.com
Evidence: • DNS Record NS: celeste.ns.cloudflare.com • DNS Record NS: sergi.ns.cloudflare.com

Analytics & Marketing (2)

Analytics	Cloudflare Web Analytics https://www.cloudflare.com/web-analytics
Evidence: • HTML <script>: https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015

Analytics	Google Tag Manager https://tagmanager.google.com
Evidence: • HTML <script>: https://www.googletagmanager.com/gtag/js?id=G-QKNEXS1S54

Security & Privacy (2)

Security	Cloudflare DMARC Monitoring https://www.cloudflare.com
Evidence: • DMARC RUA: mailto:b19f38a7b7714b61b84c228ff79401bc@dmarc-reports.cloudflare.net

Security	Cloudflare NEL Monitoring https://www.cloudflare.com
Evidence: • Header Report-To: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=Cn9ONM2Yh87519feodkwRTrXbcsRqqTqEc39L12WggwKOJXfPiwMupSgkozs9hrTRUNwukcDcS8D9qWI213RU10uucQtEGlUX5nBfqqXAeYy%2Btiu44dU"}]}

SSL & Certificates (1)

Certificate Authority	Google Trust https://pki.goog
Evidence: • SSL Certificate Issuer: C=US, O=Google Trust Services, CN=WE1

Other (3)

Cloud	Cloudflare https://www.cloudflare.com
Evidence: • HTML <script>: https://geoffreychallen.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js • IP 104.21.63.241 → ASN 13335

Framework	Next.js https://nextjs.org/
Evidence: • Header X-Nextjs-Cache: HIT • Header X-Powered-By: Next.js • HTML <script>: https://geoffreychallen.com/_next/static/chunks/a6dad97d9634a72d.js • HTML <script>: https://geoffreychallen.com/_next/static/chunks/ad1f60fd9ba49763.js • HTML <script>: https://geoffreychallen.com/_next/static/chunks/a543066b8496b0a4.js ... and 13 more

Registrar	Cloudflare Registrar https://www.cloudflare.com
Evidence: • WHOIS Registrar: Cloudflare, Inc.

Metadata & SEO

Title

Geoffrey Challen : Teaching Faculty

Description

Hi, I'm Geoff Challen. I love to teach, and I love to code. I teach students to code. And I write code that helps them learn.

Language

en

Viewport

width=device-width, initial-scale=1.0

Domain Owner Information

View Full WHOIS

Registrar

Cloudflare, Inc.

Created

February 07, 2017

8 years 289 days old

Expires

February 07, 2026

2 months 17 days left

SSL/TLS Certificate

View Full SSL Report

Issued By

C=US, O=Google Trust Services, CN=WE1

Security Score

75 /100

Social Media Cards

OpenGraph (2 properties)

Description

Hi, I'm Geoff Challen. I love to teach, and I love to code. I teach students to code. And I write code that helps them learn.

Title

Geoffrey Challen, Teaching Faculty

Network & Hosting

View DNS Records

104.21.63.241 • AS13335

Cloudflare

External Dependencies

cloudflareinsights.com (1 resources)

Scripts (1)

• https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015

googletagmanager.com (1 resources)

Scripts (1)

• https://www.googletagmanager.com/gtag/js?id=G-QKNEXS1S54

jsdelivr.net (2 resources)

Scripts (1)

• https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js

Stylesheets (1)

• https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css

Inspected on November 26, 2025 at 10:00 UTC

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