21company.com
株式会社21Company – 広島から全国へドメイン・サーバ・レンタルDNS・SSLサーバ証明書・ISPサービスを展開する21Company（ニジュウイチカンパニー）です
Last scanned Aug 24, 2026, 1:22 PM
Overall score
Great
Summary
広島から全国へドメイン・サーバ・レンタルDNS・SSLサーバ証明書・ISPサービスを展開する21Company（ニジュウイチカンパニー）です. This website uses WordPress hosted on XSERVER - Xserver Inc., JP. SEO is good (80/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
広島から全国へドメイン・サーバ・レンタルDNS・SSLサーバ証明書・ISPサービスを展開する21Company（ニジュウイチカンパニー）です
- Japan
- Hosted on XSERVER - Xserver Inc., JP
Top issues to fix
8 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
+2 more issues — details in the sections below.
SEO
3 issue(s) found
Performance
227 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
広島から全国へドメイン・サーバ・レンタルDNS・SSLサーバ証明書・ISPサービスを展開する21Company（ニジュウイチカンパニー）です
Contact
Email, phone, and address published on this site's own pages.
Source: https://21company.com/contact/
Meta tags
- Title
- 株式会社21Company – 広島から全国へドメイン・サーバ・レンタルDNS・SSLサーバ証明書・ISPサービスを展開する21Company（ニジュウイチカンパニー）です
- Description
- 広島から全国へドメイン・サーバ・レンタルDNS・SSLサーバ証明書・ISPサービスを展開する21Company（ニジュウイチカンパニー）です
- Canonical
- https://21company.com/
- Language
- ja
- Charset
- UTF-8
- Viewport
- width=device-width
- Robots meta
- max-image-preview:large
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- XSERVER - Xserver Inc., JP
- CDN provider
- —
- IP address
- 162.43.104.86
- ASN
- AS131965 (XSERVER - Xserver Inc., JP)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.21company.com
- Valid from
- Aug 15, 2026
- Valid to
- Nov 13, 2026
- Days until expiry
- 81
- SAN domains
- 21company.com, www.21company.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 1 · H2 3 · H3 23
Links
24 internal · 6 external · 1 broken
Images
9 total · 0 missing alt
Scripts / Styles
22 scripts · 7 stylesheets
JS / CSS size
530 KB · 250 KB
Page size
56.6 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 1
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Title longer than 60 characters
- Meta description longer than 160 characters
- No structured data (JSON-LD) found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://21company.com
- Final URL
- https://21company.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 226 ms
- HTML size
- 56.6 KB
- Redirect chain
- https://21company.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does 21company.com use?
- 21company.com is built with WordPress, jQuery, Meta Pixel, Nginx.
- Is 21company.com secure (HTTPS)?
- Yes. 21company.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 13, 2026.
- Who hosts 21company.com?
- 21company.com is hosted on XSERVER - Xserver Inc., JP.
- What is 21company.com's SEO score?
- 21company.com scored 80/100 for SEO in the latest analysis (great).
- What is 21company.com's overall website score?
- 21company.com has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card