URL Inspection: https://codecrafters.io

Open Cached · just now

HTTP Status

200

Ping

7 ms

Technologies

Technologies Detected

Frameworks (1)

Framework	Next.js Next.js is a React-based web framework that enables server-side rendering, static site generation, and API routes.
Description: Next.js is a React-based web framework that enables server-side rendering, static site generation, and API routes. It provides automatic code splitting, optimized performance, and a great developer experience for building production-ready React applications and websites. View full details
Evidence: • Header X-Nextjs-Prerender: 1 • Header X-Nextjs-Stale-Time: 300 • HTML <script>: https://codecrafters.io/_next/static/chunks/82abf2d65f5428ae.js?dpl=dpl_3n3dHw84MWMcz1rBk5CDxkR6d1L2 • HTML <script>: https://codecrafters.io/_next/static/chunks/4cc718a7115b4702.js?dpl=dpl_3n3dHw84MWMcz1rBk5CDxkR6d1L2 • HTML <script>: https://codecrafters.io/_next/static/chunks/1c9669fd87998ca9.js?dpl=dpl_3n3dHw84MWMcz1rBk5CDxkR6d1L2 ... and 11 more

CMS & Content (1)

CMS	Discourse Discourse is a modern, open-source discussion platform and forum software.
Description: Discourse is a modern, open-source discussion platform and forum software. It's designed for community building and online discussions, providing real-time updates, moderation tools, and a mobile-responsive interface. Discourse is used by many communities and organizations for hosting forums. View full details
Evidence: • Subdomain forum.codecrafters.io: CNAME: Reverse DNS: codecrafters.hosted-by-discourse.com

Infrastructure & Network (6)

CDN	Cloudflare CDN Cloudflare CDN is a global content delivery network that accelerates and protects websites and applications.
Description: Cloudflare CDN is a global content delivery network that accelerates and protects websites and applications. It provides DDoS protection, SSL/TLS encryption, web performance optimization, and caching services through its worldwide network of data centers. View full details
Evidence: • Subdomain git.codecrafters.io: CNAME: Reverse DNS: gcp-us-west1-1.origin.onrender.com.cdn.cloudflare.net

DNS Provider	DigitalOcean DigitalOcean is a cloud infrastructure provider that offers managed DNS services along with cloud computing, storage, and networking solutions.
Description: DigitalOcean is a cloud infrastructure provider that offers managed DNS services along with cloud computing, storage, and networking solutions. It provides simple DNS management integrated with its cloud platform. View full details
Evidence: • DNS Record NS: ns1.digitalocean.com • DNS Record NS: ns2.digitalocean.com • DNS Record NS: ns3.digitalocean.com

Email Provider	Google Workspace Google Workspace (formerly G Suite) provides business email hosting using Gmail's infrastructure.
Description: Google Workspace (formerly G Suite) provides business email hosting using Gmail's infrastructure. It offers custom domain email addresses, large storage capacity, advanced spam filtering, and integration with Google's productivity suite. View full details
Evidence: • DNS Record MX: aspmx.l.google.com • DNS Record MX: alt1.aspmx.l.google.com • DNS Record MX: alt2.aspmx.l.google.com • DNS Record MX: alt3.aspmx.l.google.com • DNS Record MX: alt4.aspmx.l.google.com ... and 1 more

Hosting	Vercel Vercel is a platform for deploying and hosting frontend applications and static websites.
Description: Vercel is a platform for deploying and hosting frontend applications and static websites. It provides continuous deployment from Git, automatic HTTPS, global CDN distribution, serverless functions, and edge computing capabilities for modern web development, with excellent Next.js integration. View full details
Evidence: • Header Server: Vercel • Header X-Vercel-Cache: HIT • Header X-Vercel-Id: iad1::q85zk-1792250238086-d7af0715ddf2 • DNS Record NS: ns1.vercel-dns-3.com • DNS Record NS: ns2.vercel-dns-3.com ... and 3 more

Registrar	Gandi SAS Gandi is a French domain registrar and web hosting company known for its commitment to transparency, privacy, and ethical business practices.
Description: Gandi is a French domain registrar and web hosting company known for its commitment to transparency, privacy, and ethical business practices. It provides domain registration, web hosting, email, and SSL certificates with a focus on simplicity and user rights. View full details
Evidence: • WHOIS Registrar: Gandi SAS GANDI SAS

Registrar	Hetzner Online Hetzner Online is a German web hosting and cloud provider that also offers domain registration services.
Description: Hetzner Online is a German web hosting and cloud provider that also offers domain registration services. It provides domain registration along with dedicated servers, cloud hosting, and VPS services, primarily serving the European market. View full details
Evidence: • IP 167.235.220.62 → ASN 24940 (Hetzner)

Analytics & Marketing (1)

Analytics	Google Tag Manager Google Tag Manager is a tag management system that allows marketers to manage and deploy marketing tags (analytics, tracking pixels, etc.) on websites without modifying code.
Description: Google Tag Manager is a tag management system that allows marketers to manage and deploy marketing tags (analytics, tracking pixels, etc.) on websites without modifying code. It provides a centralized interface for managing multiple tracking and analytics tools, improving website performance and simplifying tag deployment. View full details
Evidence: • Resource Hint (Dns Prefetch): https://www.googletagmanager.com • Resource Hint (Preconnect): https://www.googletagmanager.com

Advertising & Payments (1)

Payments	Stripe Stripe is a payment processing platform that helps businesses accept online payments.
Description: Stripe is a payment processing platform that helps businesses accept online payments. It provides payment APIs, subscription billing, marketplace payments, and financial infrastructure for internet businesses of all sizes. View full details
Evidence: • DNS Record TXT: stripe-verification=1089f3cde7a2c01b6dc539a915b9600104c74f456d6ffe5ed63674d51d3e3700

Security & Privacy (1)

Security	DMARC Digests DMARC Digests is a DMARC monitoring and reporting service that helps organizations track and analyze DMARC reports.
Description: DMARC Digests is a DMARC monitoring and reporting service that helps organizations track and analyze DMARC reports. It provides daily digest emails summarizing DMARC authentication results, helping organizations monitor email authentication and identify potential issues. View full details
Evidence: • DMARC RUA: mailto:re+b74a7b17fede@inbound.dmarcdigests.com

SSL & Certificates (1)

Certificate Authority	Let's Encrypt Let's Encrypt is a free, automated, and open certificate authority run by the Internet Security Research Group (ISRG).
Description: Let's Encrypt is a free, automated, and open certificate authority run by the Internet Security Research Group (ISRG). It provides free SSL/TLS certificates to enable encrypted HTTPS on websites, making web security accessible to everyone. It's one of the most widely used certificate authorities globally. View full details
Evidence: • SSL Certificate Issuer: C=US, O=Let's Encrypt, CN=YR2

Other (10)

Cloud	AWS AWS (Amazon Web Services) is Amazon's cloud computing platform that provides a wide range of cloud services including computing, storage, databases, networking, analytics, machine learning, and more. Active incidents
Description: AWS (Amazon Web Services) is Amazon's cloud computing platform that provides a wide range of cloud services including computing, storage, databases, networking, analytics, machine learning, and more. It's one of the leading cloud infrastructure providers globally. View full details
Evidence: • IP 216.150.1.1 → ASN 16509 (Amazon) • Subdomain m.codecrafters.io: Reverse DNS: ec2-23-21-229-175.compute-1.amazonaws.com

Cloud	AWS EC2 AWS EC2 (Elastic Compute Cloud) is Amazon's scalable cloud computing service that provides resizable compute capacity in the cloud.
Description: AWS EC2 (Elastic Compute Cloud) is Amazon's scalable cloud computing service that provides resizable compute capacity in the cloud. It allows users to launch virtual servers (instances) on demand, configure security and networking, and scale capacity up or down based on demand. View full details
Evidence: • Subdomain m.codecrafters.io: Reverse DNS: ec2-23-21-229-175.compute-1.amazonaws.com

Cloud	Render Render is a cloud platform that provides hosting for web services, static sites, and databases.
Description: Render is a cloud platform that provides hosting for web services, static sites, and databases. It offers automatic deployments from Git, SSL certificates, and managed infrastructure, making it simple for developers to deploy and scale applications. View full details
Evidence: • Subdomain git.codecrafters.io: CNAME: Reverse DNS: git-server-prod.onrender.com • Subdomain git.codecrafters.io: Reverse DNS: ip-216-24-57-16.ingress.render.com

Customer Support	Help Scout Help Scout is a customer support platform that provides help desk software, email support, live chat, and knowledge base tools.
Description: Help Scout is a customer support platform that provides help desk software, email support, live chat, and knowledge base tools. It helps businesses manage customer conversations, provide excellent support experiences, and build customer relationships through personalized communication and support workflows. View full details
Evidence: • DNS Record TXT (SPF): v=spf1 a mx include:_mailcust.gandi.net include:helpscoutemail.com include:_spf.google.com include:_spf.mlsend.com ~all

Email	MailerLite MailerLite is an email marketing platform that provides tools for creating, sending, and managing email campaigns.
Description: MailerLite is an email marketing platform that provides tools for creating, sending, and managing email campaigns. It offers a user-friendly interface, email automation, landing pages, and analytics at an affordable price point for small and medium businesses. View full details
Evidence: • DNS Record TXT: mailerlite-domain-verification=ac368294fbc1b085298f3a3f86425422019e7812

Email	MailerSend MailerSend is a transactional email service that provides reliable delivery for notifications, password resets, and order confirmations.
Description: MailerSend is a transactional email service that provides reliable delivery for notifications, password resets, and order confirmations. It offers REST API, SMTP relay, templates, and SDKs for developers and applications. View full details
Evidence: • DNS Record TXT (SPF): v=spf1 a mx include:_mailcust.gandi.net include:helpscoutemail.com include:_spf.google.com include:_spf.mlsend.com ~all

Product Analytics	PostHog PostHog is an open-source product analytics platform that helps teams understand user behavior, run experiments, and build session replay and feature flags.
Description: PostHog is an open-source product analytics platform that helps teams understand user behavior, run experiments, and build session replay and feature flags. View full details
Evidence: • Resource Hint (Dns Prefetch): https://us.i.posthog.com • Resource Hint (Dns Prefetch): https://us-assets.i.posthog.com

SEO	Ahrefs Ahrefs is a comprehensive SEO toolset that provides backlink analysis, keyword research, competitor analysis, and site auditing tools.
Description: Ahrefs is a comprehensive SEO toolset that provides backlink analysis, keyword research, competitor analysis, and site auditing tools. It helps SEO professionals and marketers improve search rankings, analyze competitors, and track SEO performance. View full details
Evidence: • DNS Record TXT: ahrefs-site-verification_6cf0bd79ac88aab9989d5feb019e947510658a1e66a351928841f7af113fb5c2

SEO	Google Console Google Search Console (formerly Google Webmaster Tools) is a free service from Google that helps website owners monitor and maintain their site's presence in Google search results.
Description: Google Search Console (formerly Google Webmaster Tools) is a free service from Google that helps website owners monitor and maintain their site's presence in Google search results. It provides insights into search performance, indexing status, and technical SEO issues. View full details
Evidence: • DNS Record TXT: google-site-verification=AGm60ZhZCnOeDzW--6T0Pp940BXJDapHg05sXL4Es5M • DNS Record TXT: google-site-verification=VkEBUXig99mOlEuWre0xMpn2Ytf1rL-0_pSdXjUWdFY • DNS Record TXT: google-site-verification=ZD5_bhJT0PfdQDTic8VGN1ERtYOJ8cuIXm9kQLd5NsI

Status Page	Better Uptime Better Uptime is a website monitoring and status page service that helps organizations track website availability and communicate status to users.
Description: Better Uptime is a website monitoring and status page service that helps organizations track website availability and communicate status to users. It provides uptime monitoring, incident management, and status pages to help teams ensure service reliability and keep users informed. View full details
Evidence: • Subdomain status.codecrafters.io: CNAME: Reverse DNS: statuspage.betteruptime.com

Metadata & SEO

Title

CodeCrafters | The Hardest Programming Challenges on the Internet

Description

Build your own Redis, Git, SQLite, and more from scratch. Advanced challenges designed for experienced engineers, used by developers at Google, OpenAI, and Vercel.

Keywords

programming challenges,software engineering,coding practice,build your own,Redis,Git,SQLite,advanced programming,software craftsmanship

Canonical URL

https://codecrafters.io

Language

Viewport

width=device-width, initial-scale=1

Domain Owner Information

View Full WHOIS

Registrar

Gandi SAS GANDI SAS

Created

November 12, 2019

6 years 314 days old

Expires

November 12, 2026

1 months 22 days left

SSL/TLS Certificate

View Full SSL Report

Issued By

C=US, O=Let's Encrypt, CN=YR2

Security Score

86 /100

Social Media Cards

OpenGraph (6 properties)

Description

Build your own Redis, Git, SQLite, and more from scratch. Advanced challenges designed for experienced engineers, used by developers at Google, OpenAI, and Vercel.

Title

CodeCrafters | The Hardest Programming Challenges on the Internet

Image

https://codecrafters.io/meta.jpg

Image:width

1200

Image:height

640

Image:type

image/jpeg

Twitter Cards (6 properties)

Description

Advanced programming challenges for experienced engineers. Rebuild real production tools like Redis, Git, and SQLite from scratch in your IDE. Used by engineers at Google, OpenAI, and Vercel.

Title

CodeCrafters | Rebuild Redis, Git & SQLite From Scratch

Image

https://codecrafters.io/meta.jpg

Card

summary_large_image

Site

@codecraftersio

Creator

@codecraftersio

Network & Hosting

View DNS Records

216.150.1.1 • AS16509

Amazon

216.24.57.16 • AS397273

Render

Reverse DNS: ip-216-24-57-16.ingress.render.com

23.21.229.175 • AS14618

Amazon

Reverse DNS: ec2-23-21-229-175.compute-1.amazonaws.com

167.235.220.62 • AS24940

Hetzner

Reverse DNS: statuspage-1.betteruptime.com

216.66.8.43 • AS6939

Hurricane Electric

2602:FD3F:2:FF01:0:0:0:2B • AS394230

Discourse

CNAME Record

This domain is an alias for:

e511a7fc88ff0468.vercel-dns-016.com

Resources

codecrafters.io (81 resources)

Scripts (12)

Stylesheets (1)

• stylesheet crossorigin:- integrity:no https://codecrafters.io/_next/static/chunks/248f5d76389bfdad.css?dpl=dpl_3n3dHw84MWMcz1rBk5CDxkR6d1L2

Technologies Detected

Frameworks (1)

CMS & Content (1)

Infrastructure & Network (6)

Analytics & Marketing (1)

Advertising & Payments (1)

Security & Privacy (1)

SSL & Certificates (1)

Other (10)

Metadata & SEO

Domain Owner Information

SSL/TLS Certificate

Social Media Cards

OpenGraph (6 properties)

Twitter Cards (6 properties)

Network & Hosting

CNAME Record

Resources

codecrafters.io (81 resources)

Scripts (12)

Stylesheets (1)

Fonts (3)

Images (58)

Resource Hints (7)

googletagmanager.com (2 resources)

Resource Hints (2)

helpscout.net (1 resources)

Resource Hints (1)

lobbyside.com (1 resources)

Resource Hints (1)

posthog.com (2 resources)

Resource Hints (2)