What technology does man7.org use?

man7.org is built with Google Analytics, Apache.

Is man7.org secure (HTTPS)?

Yes. man7.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 19, 2026.

man7.org is hosted on MNET-AS - M-net Telekommunikations GmbH, DE.

What is man7.org's SEO score?

man7.org scored 60/100 for SEO in the latest analysis (fair).

What is man7.org's overall website score?

man7.org has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.

man7.org

Michael Kerrisk - man7.org

Last scanned Jul 21, 2026, 11:40 AM · 2 views

Overall score

Fair

Top issues to fix

11 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEO
Add a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.

+5 more issues — details in the sections below.

Summary

This website uses Apache hosted on MNET-AS - M-net Telekommunikations GmbH, DE. SEO is fair (60/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing meta description.

SEO

6 issue(s) found

100

Performance

136 ms

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Contact

Email, phone, and address published on this site's own pages.

Email: alx@kernel.org linux-man@vger.kernel.org mtk@man7.org

Source: https://man7.org/mtk/contact.html

Technologies

Detected frameworks, languages, and tools.

Google Analytics Apache

Hosting & CDN

Hosting provider: MNET-AS - M-net Telekommunikations GmbH, DE
CDN provider: —
IP address: 45.84.74.9
ASN: AS8767 (MNET-AS - M-net Telekommunikations GmbH, DE)

DNS records

Type	Value
A	45.84.74.9
AAAA	—
MX	ASPMX.L.GOOGLE.COM alt2.ASPMX.L.GOOGLE.COM ALT4.ASPMX.L.GOOGLE.COM ALT3.ASPMX.L.GOOGLE.COM alt1.ASPMX.L.GOOGLE.COM
TXT	google-site-verification=6yqdzWtjBD9BVkrXEriCj0oCiw6p0kAOdZs09mcRoeg v=spf1 include:_spf.google.com ~all
NS	ns-102-a.gandi.net ns-203-b.gandi.net ns-24-c.gandi.net
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: kerrisk.com
Valid from: Jun 21, 2026
Valid to: Sep 19, 2026
Days until expiry: 60
SAN domains: kerrisk.com, linuxprogramminginterface.com, linuxsystemprogramming.com, linuxsystemsprogramming.com, man7.org, michaelkerrisk.com, thelinuxprogramminginterface.com, trainingfromthefuture.com, www.kerrisk.com, www.linuxprogramminginterface.com, www.linuxsystemprogramming.com, www.linuxsystemsprogramming.com, www.man7.org, www.michaelkerrisk.com, www.thelinuxprogramminginterface.com, www.trainingfromthefuture.com

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 10 · H2 0 · H3 0

Links

7 internal · 2 external · 1 broken

Images

2 total · 0 missing alt

Scripts / Styles

4 scripts · 1 stylesheets

JS / CSS size

506 B · 4.7 KB

Page size

4.9 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 4
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing meta description
Missing canonical link
Multiple H1 headings found
No structured data (JSON-LD) found
Missing OpenGraph tags
sitemap.xml not found

Scan details

Requested URL: https://man7.org
Final URL: https://man7.org
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 136 ms
HTML size: 4.9 KB
Redirect chain: https://man7.org

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Frequently asked questions

What technology does man7.org use?: man7.org is built with Google Analytics, Apache.
Is man7.org secure (HTTPS)?: Yes. man7.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 19, 2026.
Who hosts man7.org?: man7.org is hosted on MNET-AS - M-net Telekommunikations GmbH, DE.
What is man7.org's SEO score?: man7.org scored 60/100 for SEO in the latest analysis (fair).
What is man7.org's overall website score?: man7.org has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.