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jvn.jp

Japan Vulnerability Notes

Last scanned Aug 24, 2026, 1:21 PM · 2 views

76

Overall score

Fair

Summary

Japan Vulnerability Notes. This website uses Apache hosted on AWS behind CloudFront CDN. SEO is fair (60/100) and accessibility is good (85/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.

Japan Vulnerability Notes

United States
Hosted on AWS

Top issues to fix

11 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.

  • 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 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.

+5 more issues — details in the sections below.

60

SEO

6 issue(s) found

100

Performance

265 ms

65

Security

HTTPS & header checks

85

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.

Japan Vulnerability Notes

Contact

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

Source: https://jvn.jp/contact/index.html

Meta tags

Title
Japan Vulnerability Notes
Description
Japan Vulnerability Notes
Canonical
Language
ja
Charset
UTF-8
Viewport
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Apache

Hosting & CDN

Hosting provider
AWS
CDN provider
CloudFront
IP address
18.66.41.72
ASN
AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

TypeValue
A
  • 18.66.41.72
  • 18.66.41.59
  • 18.66.41.7
  • 18.66.41.79
AAAA—
MX
  • mx21.jpcert.or.jp
  • mx11.jpcert.or.jp
TXT
  • BTdjSq62rYVFoxOVgRwDwO4qCGyF0A
  • gS9zQtynq4MDUCoJGK4gEPWTZkQFMB
  • E2E3jyfEnthyzxy59zYwkiddttVL7l
  • v=spf1 a:mx11.jpcert.or.jp a:mx21.jpcert.or.jp -all
  • uLZGUet7pNlRUlF0nFE1Ba63kMrFSm
NS
  • ns-1398.awsdns-46.org
  • ns-1813.awsdns-34.co.uk
  • ns-843.awsdns-41.net
  • ns-157.awsdns-19.com
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Cybertrust Japan Co., Ltd.
Subject
jvn.jp
Valid from
Jan 7, 2026
Valid to
Jan 31, 2027
Days until expiry
159
SAN domains
jvn.jp

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 0 · H2 0 · H3 0

Links

37 internal · 12 external · 0 broken

Images

37 total · 0 missing alt

Scripts / Styles

1 scripts · 3 stylesheets

JS / CSS size

1.6 KB · 3.2 KB

Page size

20.3 KB

Robots.txt & Sitemap

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

SEO issues

  • Missing canonical link
  • No H1 heading found
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found
  • Missing viewport meta tag

Scan details

Requested URL
https://jvn.jp
Final URL
https://jvn.jp
HTTP status
200
HTTP version
HTTP/2
Response time
265 ms
HTML size
20.3 KB
Redirect chain
https://jvn.jp

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does jvn.jp use?
jvn.jp is built with Apache.
Is jvn.jp secure (HTTPS)?
Yes. jvn.jp uses TLS 1.3 with a certificate issued by Cybertrust Japan Co., Ltd., valid until Jan 31, 2027.
Who hosts jvn.jp?
jvn.jp is hosted on AWS, behind CloudFront CDN.
What is jvn.jp's SEO score?
jvn.jp scored 60/100 for SEO in the latest analysis (fair).
What is jvn.jp's overall website score?
jvn.jp has an overall SiteGraph score of 76/100, combining SEO, performance, security, and accessibility.