zndns.com

ZnDNS-免费智能DNS解析服务商-分地区-分线路-防攻击-防宕机

Last scanned Jul 25, 2026, 2:25 AM · 2 views

70

Overall score

Fair

Summary

ZnDNS是国内最早智能DNS解析服务商，致力于为各类网站提供高质量智能DNS解析，同时也提供免费DNS解析服务。. This website uses Nginx hosted on AWS. SEO is fair (55/100) and accessibility is fair (60/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

ZnDNS是国内最早智能DNS解析服务商，致力于为各类网站提供高质量智能DNS解析，同时也提供免费DNS解析服务。

United States

Hosted on AWS

Top issues to fix

14 issues found · 4 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.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
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.

+8 more issues — details in the sections below.

55

SEO

7 issue(s) found

100

Performance

112 ms

65

Security

HTTPS & header checks

60

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.

Organization

Company details published in this site's own structured data.

ZnDNS是国内最早智能DNS解析服务商，致力于为各类网站提供高质量智能DNS解析，同时也提供免费DNS解析服务。

Contact

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

Email: service@zndns.com support@zndns.com

Source: https://www.zndns.com/contact_url_action.do#contact-form

Meta tags

Title: ZnDNS-免费智能DNS解析服务商-分地区-分线路-防攻击-防宕机
Description: ZnDNS是国内最早智能DNS解析服务商，致力于为各类网站提供高质量智能DNS解析，同时也提供免费DNS解析服务。
Canonical
Language: zh-CN
Charset: utf-8
Viewport: width=device-width,initial-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Hosting & CDN

Hosting provider: AWS
CDN provider: —
IP address: 13.212.126.249
ASN: AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

Type	Value
A	13.212.126.249
AAAA	—
MX	mxbiz1.qq.com mxbiz2.qq.com
TXT	v=spf1 include:spf.mail.qq.com ~all
NS	vip4.zndns.com vip3.zndns.com vip2.zndns.com vip1.zndns.com
CAA	—
CNAME	zndns.com
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: *.zndns.com
Valid from: Jul 16, 2026
Valid to: Oct 14, 2026
Days until expiry: 81
SAN domains: *.zndns.com, zndns.com

Security headers

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

Compression: none · 1 cookie(s) observed

Content & assets

Headings

H1 0 · H2 7 · H3 9

Links

12 internal · 9 external · 6 broken

Images

4 total · 3 missing alt

Scripts / Styles

7 scripts · 2 stylesheets

JS / CSS size

109 KB · 55.9 KB

Page size

29.9 KB

Robots.txt & Sitemap

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

SEO issues

Title longer than 60 characters
Missing canonical link
No H1 heading found
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://zndns.com
Final URL: https://www.zndns.com/
HTTP status: 200
HTTP version: HTTP/2
Response time: 112 ms
HTML size: 29.9 KB
Redirect chain: https://zndns.com → https://www.zndns.com/

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Frequently asked questions

What technology does zndns.com use?: zndns.com is built with jQuery, Nginx.
Is zndns.com secure (HTTPS)?: Yes. zndns.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 14, 2026.
Who hosts zndns.com?: zndns.com is hosted on AWS.
What is zndns.com's SEO score?: zndns.com scored 55/100 for SEO in the latest analysis (fair).
What is zndns.com's overall website score?: zndns.com has an overall SiteGraph score of 70/100, combining SEO, performance, security, and accessibility.