Is zlib.net secure (HTTPS)?

Yes. zlib.net uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 15, 2026.

zlib.net is hosted on A2HOSTING - A2 Hosting, Inc., US.

What is zlib.net's SEO score?

zlib.net scored 65/100 for SEO in the latest analysis (fair).

What is zlib.net's overall website score?

zlib.net has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.

zlib.net

zlib Home Site

Last scanned Jul 21, 2026, 11:40 AM · 1 view

Overall score

Great

Top issues to fix

9 issues found · 3 high priority

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 viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEO
Add og:title/og:description/og:image so shared links render a proper preview card.

+3 more issues — details in the sections below.

Summary

This website uses Apache hosted on A2HOSTING - A2 Hosting, Inc., US. SEO is fair (65/100) and accessibility is good (85/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing meta description.

SEO

5 issue(s) found

100

Performance

257 ms

Security

HTTPS & header checks

Accessibility

2 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.

Technologies

Detected frameworks, languages, and tools.

Apache

Hosting & CDN

Hosting provider: A2HOSTING - A2 Hosting, Inc., US
CDN provider: —
IP address: 85.187.148.2
ASN: AS55293 (A2HOSTING - A2 Hosting, Inc., US)

DNS records

Type	Value
A	85.187.148.2
AAAA	—
MX	zlib.net
TXT	v=spf1 +mx +a +ip4:68.66.224.49 ~all
NS	ns3.a2hosting.com ns2.a2hosting.com ns4.a2hosting.com ns1.a2hosting.com
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: mail.zlib.net
Valid from: Jul 17, 2026
Valid to: Oct 15, 2026
Days until expiry: 85
SAN domains: autodiscover.zlib.net, cpanel.zlib.net, cpcalendars.zlib.net, cpcontacts.zlib.net, mail.zlib.net, webdisk.zlib.net, webmail.zlib.net, www.zlib.madler.net, www.zlib.net, zlib.madler.net, zlib.net

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsEnabled
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 0 · H3 5

Links

23 internal · 65 external · 10 broken

Images

73 total · 0 missing alt

Scripts / Styles

0 scripts · 0 stylesheets

JS / CSS size

0 B · 76 B

Page size

31.3 KB

Robots.txt & Sitemap

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

SEO issues

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

Scan details

Requested URL: https://zlib.net
Final URL: https://zlib.net
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 257 ms
HTML size: 31.3 KB
Redirect chain: https://zlib.net

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Frequently asked questions

What technology does zlib.net use?: zlib.net is built with Apache.
Is zlib.net secure (HTTPS)?: Yes. zlib.net uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 15, 2026.
Who hosts zlib.net?: zlib.net is hosted on A2HOSTING - A2 Hosting, Inc., US.
What is zlib.net's SEO score?: zlib.net scored 65/100 for SEO in the latest analysis (fair).
What is zlib.net's overall website score?: zlib.net has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.