neetcode.io
No paid content found
Categories: Education & Learning Development
Practice coding interviews with structured courses, AI-assisted assessments, head-to-head Versus mode, and 1,000+ problems.
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Updated: 2026-09-25 14:32
Language: English (default)
Access: Normal
Profile views 7
Outbound visits 2
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Website Overview
Several search or sharing settings need attention. Together they may make snippets, preview images or preferred URLs less consistent across platforms. An active inbound-mail setup with incomplete authentication may leave the domain more open to impersonation. Provider hosting alone does not close that gap.
Domain and Registration
Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The domain has about 4 years of registration history; its current configuration provides more context than age alone. The domain uses the common .io extension, which is not an independent safety signal.
DNS and Email
The observed email authentication setup is incomplete: SPF is missing. Nameservers are provided by Google Cloud DNS, indicating managed DNS hosting. MX records point to the Google Workspace email service. DNSSEC is enabled, allowing validating resolvers to authenticate signed DNS data. No CNAME was found; the observed records resolve directly to addresses.
TLS and Certificates
The certificate uses an RSA 2048-bit public key, offering broad client compatibility. The server supplied a complete certificate chain. No organization name is present in the certificate; the available fields are consistent with domain validation. The certificate was issued within the Google Trust Services cloud or CDN ecosystem. The certificate's total validity is about 90 days, consistent with a short renewal cycle.
HTTP and Browser Security
The response lacks these common security headers: CSP, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, clickjacking protection. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. The x-cache, x-served-by response header indicates a CDN or caching proxy in the delivery path. No obvious internal addresses or debug information were found in the headers. No CORS permission header was found, so browsers normally restrict cross-origin script access.
Technology Stack Analysis
The public page identifies Angular, Tailwind CSS, Fastly without precise versions, leaving fewer clues for version-specific scanning.
Search and Social Sharing
No homepage canonical URL was detected. If duplicate URLs exist, consolidation may be less explicit. Open Graph is partially configured; og:image is missing. Twitter Card metadata is configured. The title has 54 characters, within a common display range. A meta description is present, with 123 characters.
Hosting and Email
Google Cloud DNS
Hosting
Fastly
Google Workspace
Location
United States
Pages, Search and Sharing
| Meta description | Practice coding interviews with structured courses, AI-assisted assessments, head-to-head Versus mode, and 1,000+ problems. |
|---|---|
| Canonical URL | Not detected |
| Language | English (default) |
| Twitter Card | summary_large_image |
Social Sharing Preview
6 fieldsSharing metadata
| og:url | https://neetcode.io/ |
|---|---|
| og:type | website |
| og:title | NeetCode | Coding Interview Prep, Courses, Versus Mode |
| og:site_name | NeetCode |
| og:description | Practice coding interviews with structured courses, AI-assisted assessments, head-to-head Versus mode, and 1,000+ problems. |
| twitter:card | summary_large_image |
robots.txt (opens in a new tab)
0 rulesAll bots 0 allowed · 0 disallowed
All bots
No matching rules.
Sitemaps
1
Registration details RDAP / WHOIS
| Registrar | Key-Systems GmbH |
|---|---|
| Registered | 2022-01-17 |
| Expires | 2027-01-17 |
| Domain status | clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited、clientTransferProhibited https://icann.org/epp#clientTransferProhibited |
| Nameservers | ns-cloud-e1.googledomains.com、ns-cloud-e2.googledomains.com、ns-cloud-e3.googledomains.com、ns-cloud-e4.googledomains.com |
| DNSSEC | signed |
DNS records
| Type | Name | Value | TTL | Priority |
|---|---|---|---|---|
| A | neetcode.io | 199.36.158.100 | 10368 | — |
| AAAA | neetcode.io | 2620:0:890::100 | 5368 | — |
| MX | neetcode.io | smtp.google.com | 14400 | 1 |
| NS | neetcode.io | ns-cloud-e1.googledomains.com | 21600 | — |
| NS | neetcode.io | ns-cloud-e2.googledomains.com | 21600 | — |
| NS | neetcode.io | ns-cloud-e3.googledomains.com | 21600 | — |
| NS | neetcode.io | ns-cloud-e4.googledomains.com | 21600 | — |
| TXT | neetcode.io | google-site-verification=8HiE15NCiCuYIZ9e0DPBbCUCyxPGhNtR5jUM-Em8D2o | 14400 | — |
| TXT | neetcode.io | google-site-verification=yWZry6C8ADqzQY0buB30EDfu7IIqVnjqbgDFA1u79Qw | 14400 | — |
| TXT | neetcode.io | linkedin-site-verification=8256b6ae-5221-4def-b2f8-23afe1607df9 | 14400 | — |
| DS | neetcode.io | 21154 8 2 a9d469891872d2714408f7a79741b00a14167faa4052b98360b9543e5acc3236 | 3600 | — |
| DMARC | _dmarc.neetcode.io | v=DMARC1; p=none; rua=mailto:[email protected]; sp=none; | 14400 | — |
TLS and certificates
| Assessment | Normal configuration |
|---|---|
| Supported protocols | TLSv1.2、TLSv1.3 |
| Negotiated protocol | TLSv1.3 |
| Certificate subject | www.invisifox.com |
| Issuer | Google Trust Services |
| Valid until | 2026-12-11T20:56 · Remaining when checked: 77 days |
| Verification details | Certificate trust: Passed · Hostname match: Passed |
HTTP response headers
| Header | Value |
|---|---|
| content-type | text/html; charset=utf-8 |
| cache-control | max-age=3600 |
| strict-transport-security | max-age=31556926 |
Identified technologies
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