简体中文
Englishcommand-not-found.com
Install any command on any operating system and in Docker.
At a glance
- Category
- Development
- Language
- English
- Paid-content signal
- No paid content foundObserved
- Registered
- 2018
- Hosting
- CloudflareInferred
- HTTPS certificate trusted
- PassedObserved
- Last updated
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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 2018, this domain has about 7 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 domain uses the common .com extension, which is not an independent safety signal.
DNS and Email
Nameservers are provided by Cloudflare, indicating managed DNS hosting. 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. DNSSEC signatures were not detected, so this additional DNS authenticity protection is not confirmed. The lowest observed DNS TTL is 100 seconds.
TLS and Certificates
The public key uses EC with 256 bits. 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, Referrer-Policy, Permissions-Policy, clickjacking protection. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. The cf-ray, via response header indicates a CDN or caching proxy in the delivery path. No obvious internal addresses or debug information were found in the headers. The Server header identifies cloudflare without an exact version.
Technology Stack Analysis
The public page identifies jQuery, Bootstrap, Google Analytics, Cloudflare 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:type is missing. The title has 21 characters, within a common display range. A meta description is present, with 58 characters. The observed directives allow indexing and link following.
Hosting and Email
CloudflareRegistration details
| Registrar | OVH sas |
|---|---|
| Registered | 2018-12-03 |
| Expires | 2026-12-03 |
| Domain status | client delete prohibited、client transfer prohibited |
| Nameservers | cheryl.ns.cloudflare.com、jerome.ns.cloudflare.com |
| DNSSEC | unsigned |
DNS records
| Type | Name | Value | TTL | Priority |
|---|---|---|---|---|
| A | command-not-found.com | 104.21.19.198 | 100 | — |
| A | command-not-found.com | 172.67.188.152 | 100 | — |
| AAAA | command-not-found.com | 2606:4700:3030::6815:13c6 | 300 | — |
| AAAA | command-not-found.com | 2606:4700:3035::ac43:bc98 | 300 | — |
| NS | command-not-found.com | cheryl.ns.cloudflare.com | 86400 | — |
| NS | command-not-found.com | jerome.ns.cloudflare.com | 86400 | — |
TLS and certificates
| Assessment | Normal configuration |
|---|---|
| Supported protocols | TLSv1.2、TLSv1.3 |
| Negotiated protocol | TLSv1.3 |
| Certificate subject | command-not-found.com |
| Issuer | Google Trust Services |
| Valid until | 2026-12-04T02:13 · Remaining when checked: 68 days |
| Verification details | Certificate trust: Passed · Hostname match: Passed |
HTTP response headers
| Header | Value |
|---|---|
| content-type | text/html; charset=UTF-8 |
| cache-control | public, max-age=0, s-maxage=5, stale-while-revalidate=600 |
| server | cloudflare |
| strict-transport-security | max-age=15552000; includeSubDomains |
| x-content-type-options | nosniff |
Identified technologies
Pages, Search and Sharing
| Meta description | Install any command on any operating system and in Docker. |
|---|---|
| Canonical URL | Not detected |
| Language | English (default) |
| Twitter Card | Not detected |
Social Sharing Preview
7 fieldsrobots.txt (opens in a new tab)
0 rulesNo rules found
No matching rules.
Sitemaps
0No sitemaps found
User reviews (0)