🌐 kernel.org 200 🔒 SSL Valid
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HTTP Status ?A three-digit code showing if the site loaded successfully (200), redirects (301/302), or has errors (4xx/5xx).Read more →
200
SSL Expires ?When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
in 87d
Domain Expires ?When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
in 142d
Hosting ?The company and location where this website's server is physically located.Read more →
Unknown
Security ?Score based on key HTTP security headers: HSTS, Content-Security-Policy, and X-Frame-Options.Read more →
3/3
IP Address ?The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
172.105.4.254
Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
N/A
Uptime
100%
⚡ Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
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Performance data not available yet.

🛠️ Tech Stack ?Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools. 1
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🖥️ Web Server
Nginx
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🌐 DNS Records ?DNS translates domain names to IP addresses. Records control where the site, email, and services are directed.Read more →
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A (IPv4)172.105.4.254
AAAA (IPv6)2600:3c04:e001:324::1991:8:25
NSns61.constellix.netns11.constellix.comns21.constellix.comns31.constellix.comns41.constellix.netns51.constellix.net
MX10 smtp3.kernel.org10 smtp1.kernel.org10 smtp2.kernel.org
TXT (2)
Services configured via TXT:
Google
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google-site-verification=nb4Wx5xBQM3b-a3OV2KSlPL786714Y7M6GfBtJf1opQ
v=spf1 include:_spf.kernel.org ~all
📋 WHOIS / RDAP ?Public registration data: who registered the domain, when, and when it expires.Read more →
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RegistrarGandi SAS
Registered1997-03-07
Expires2027-03-08 (in 142 days)
Last Updated2026-08-12
Statusclient transfer prohibited
🔒 SSL Certificate ?Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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Subject (CN)tor.source.kernel.org
IssuerLet's Encrypt
Valid From2026-10-14
Valid Until2027-01-12 (87 days left)
SANs (9)android.kernel.orggit.kernel.orgkernel.orglinux.kernel.orglore.kernel.orgorigin.kernel.orgtor.source.kernel.orgwireless.kernel.orgwww.kernel.org
📡 HTTP Headers ?Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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Status200
Servernginx
Content-Typetext/html; charset=utf-8
Final URLhttps://kernel.org/
strict-transport-securitymax-age=15768001
content-security-policydefault-src 'self' *.kernel.org; img-src https: data:
x-frame-optionsDENY
x-content-type-optionsnosniff
referrer-policysame-origin
Security headers ?HTTP headers that protect visitors from attacks. HSTS forces HTTPS, CSP controls resource loading, X-Frame-Options prevents clickjacking.Read more →
HSTS
Content-Security-Policy
X-Frame-Options
🏠 Hosting ?Physical infrastructure: where the server is, who operates it, and what network it belongs to.Read more →
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IP Address172.105.4.254
ProviderUnknown
OrganizationN/A
ASNN/A
LocationN/A
🛡️ Security Score A (6/7)
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Valid SSL
HSTS
CSP
X-Frame-Options
X-Content-Type
Referrer-Policy
Permissions-Policy
🗺️ Sitemap & Robots
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No robots.txt
This site has no robots.txt file, so crawlers may access everything by default.
Sitemap Not found
🔗 Social & Meta Tags Missing
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TitleThe Linux Kernel Archives
Languageen
📧 Mail Security ?Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
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SPF✓ Present
v=spf1 include:_spf.kernel.org ~all
DMARC✓ Present
v=DMARC1; p=quarantine; rua=mailto:[email protected]
MX Records
10 → smtp3.kernel.org
10 → smtp1.kernel.org
10 → smtp2.kernel.org
🌍 Other TLDs ?Other top-level domain variants of this domain name and their availability. 18 active 4 for sale 1 available
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.co ●
.dev ●
.app taken
.me ●
.biz ●
.eu ●
.xyz taken
.fi taken
.se ●
.de taken
.uk ●
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.nl ●
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.it ●
.us ●
.ca Available
.com.au ●
.co.uk ●
📡 Uptime Monitor
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Current Status 🟢 Online
HTTP Status 200
Response Time 136ms
Last Checked 2026-10-16 13:45:16.640784
Uptime (30d) 100%
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