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class-12-isc.vercel.app
Free Class 12 ISC notes, past prelim papers, formula sheets, and revision guides. 5,000+ curated study materials across Commerce, Science, and Humanities.
At a glance
- Category
- Other
- Language
- English
- Paid-content signal
- No paid content foundObserved
- Registered
- 2020
- Hosting
- VercelInferred
- HTTPS certificate trusted
- PassedObserved
- Last updated
Related questions
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Website Overview
An established domain and managed infrastructure suggest continuity of operations and may support dependable delivery, although neither guarantees service quality. Several search or sharing settings need attention. Together they may make snippets, preview images or preferred URLs less consistent across platforms.
Domain and Registration
Registered in 2020, this domain has about 6 years of history. That suggests continuity, although ownership and purpose may have changed. Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The registrar is Tucows Domains Inc, a widely used domain service provider. The domain uses the common .app extension, which is not an independent safety signal.
DNS and Email
Nameservers are provided by vercel-dns-3.com, indicating managed DNS hosting. CAA records restrict which certificate authorities are authorized to issue certificates. No CNAME was found; the observed records resolve directly to addresses. No MX record was found. A conventional explicit inbound-mail route is not configured. TXT records include verification markers for Google. Such markers may also remain after a service stops being used.
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 89 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. CORS permits any origin to read this response. This is common for public resources; sensitive responses need narrower handling. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. No obvious internal addresses or debug information were found in the headers. The Server header contains the custom value Vercel.
Technology Stack Analysis
The public page identifies Tailwind CSS, Google Analytics, Vercel without precise versions, leaving fewer clues for version-specific scanning.
Search and Social Sharing
The title has 68 characters and may be truncated in search results. The canonical URL points to another host: https://class12isc.dpdns.org/. Search engines may consolidate indexing signals there. Twitter Card metadata is configured. A meta description is present, with 154 characters. The observed directives allow indexing and link following.
Hosting and Email
vercel-dns-3.com
United States
Inferred
216.198.79.3
Registration details
| Registrar | Tucows Domains Inc |
|---|---|
| Registered | 2020-01-28 |
| Expires | 2036-01-28 |
| Domain status | client transfer prohibited、client update prohibited |
| Nameservers | ns1.vercel-dns-3.com、ns2.vercel-dns-3.com、ns3.vercel-dns-3.com、ns4.vercel-dns-3.com |
| DNSSEC | unsigned |
DNS records
| Type | Name | Value | TTL | Priority |
|---|---|---|---|---|
| A | class-12-isc.vercel.app | 216.198.79.3 | 300 | — |
| A | class-12-isc.vercel.app | 64.29.17.3 | 300 | — |
| NS | vercel.app | ns1.vercel-dns-3.com | 86400 | — |
| NS | vercel.app | ns2.vercel-dns-3.com | 86400 | — |
| NS | vercel.app | ns3.vercel-dns-3.com | 86400 | — |
| NS | vercel.app | ns4.vercel-dns-3.com | 86400 | — |
| TXT | vercel.app | google-site-verification=ye33zD88WkvAKX2-F2WH7Fi-QkAzvvWaPJQneD6Vt80 | 3600 | — |
| TXT | vercel.app | v=spf1 -all | 3600 | — |
| CAA | vercel.app | 0 issue "letsencrypt.org" | 3600 | — |
| CAA | vercel.app | 0 issue "pki.goog" | 3600 | — |
| DMARC | _dmarc.vercel.app | v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; | 3600 | — |
TLS and certificates
HTTP response headers
| Header | Value |
|---|---|
| content-type | text/html; charset=utf-8 |
| cache-control | public, max-age=0, must-revalidate |
| server | Vercel |
| strict-transport-security | max-age=63072000; includeSubDomains; preload |
| access-control-allow-origin | * |
Identified technologies
Pages, Search and Sharing
| Meta description | Free Class 12 ISC notes, past prelim papers, formula sheets, and revision guides. 5,000+ curated study materials across Commerce, Science, and Humanities. |
|---|---|
| Canonical URL | https://class12isc.dpdns.org/ |
| Language | English (default) |
| Twitter Card | summary_large_image |
Social Sharing Preview
11 fields
robots.txt (opens in a new tab)
3 rulesmediapartners-google 1 allowed · 0 disallowed
- Allow
/
googlebot 1 allowed · 0 disallowed
- Allow
/
All bots 1 allowed · 0 disallowed
- Allow
/
No matching rules.
User reviews (0)