What technology does numberplace.net use?

numberplace.net is built with PHP, Google Analytics, Nginx.

Is numberplace.net secure (HTTPS)?

Yes. numberplace.net uses TLS 1.2 with a certificate issued by Let's Encrypt, valid until Sep 21, 2026.

Who hosts numberplace.net?

Hosting provider information for numberplace.net is not available yet.

What is numberplace.net's SEO score?

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

What is numberplace.net's overall website score?

numberplace.net has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.

numberplace.net

ナンプレ20 - 無料数独問題集 sudoku for PC

Last scanned Jul 26, 2026, 12:49 PM

Overall score

Great

Summary

毎日20問、無料でナンプレ（数独）をブラウザでオンラインプレイできます。面倒なダウンロード・インストールや登録は一切不要です。. This website uses PHP. SEO is fair (65/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.

毎日20問、無料でナンプレ（数独）をブラウザでオンラインプレイできます。面倒なダウンロード・インストールや登録は一切不要です。

Top issues to fix

11 issues found · 2 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 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.
Meta description longer than 160 characters
SEO
Trim the meta description to under 160 characters to avoid truncation in search results.
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.

SEO

6 issue(s) found

100

Performance

354 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.

Organization

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

毎日20問、無料でナンプレ（数独）をブラウザでオンラインプレイできます。面倒なダウンロード・インストールや登録は一切不要です。

X (Twitter)

Meta tags

Title: ナンプレ20 - 無料数独問題集 sudoku for PC
Description: 毎日20問、無料でナンプレ（数独）をブラウザでオンラインプレイできます。面倒なダウンロード・インストールや登録は一切不要です。
Canonical
Language: ja
Charset: utf-8
Viewport: width=device-width, initial-scale=0.7
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

PHP Google Analytics Nginx

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.2
Issuer: Let's Encrypt
Subject: numberplace.net
Valid from: Jun 23, 2026
Valid to: Sep 21, 2026
Days until expiry: 54
SAN domains: numberplace.net, www.numberplace.net

Security headers

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

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 1 · H3 5

Links

25 internal · 1 external · 20 broken

Images

22 total · 0 missing alt

Scripts / Styles

23 scripts · 2 stylesheets

JS / CSS size

9.3 KB · 3.6 KB

Page size

26.6 KB

Robots.txt & Sitemap

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

SEO issues

Meta description longer than 160 characters
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://numberplace.net
Final URL: https://numberplace.net
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 354 ms
HTML size: 26.6 KB
Redirect chain: https://numberplace.net

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