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Domain report

j-code.org

j-code.org ranks in the top 0.14% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 7 distinct hosts observed under it.

Explore j-code.org in the Web Graph

Connectivity

#187,150harmonic-centrality rank
Top percentile
0.14%
Hosts observed
7

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

200HTTP status

https://j-code.org/ answered with HTTP 200.

DNS records

A
  • 13.71.133.247
AAAA
No records found.
MX
  • 20 alt1.aspmx.l.google.com.
  • 20 alt2.aspmx.l.google.com.
  • 10 aspmx.l.google.com.
  • 30 aspmx2.googlemail.com.
  • 30 aspmx3.googlemail.com.
  • 30 aspmx4.googlemail.com.
  • 30 aspmx5.googlemail.com.
NS
  • 01.dnsv.jp.
  • 02.dnsv.jp.
  • 03.dnsv.jp.
  • 04.dnsv.jp.

Live preview

Screenshot of j-code.org

This site sends "X-Frame-Options: DENY", which blocks embedding it here.

Since j-code.org can't be embedded live, this is a captured screenshot instead — a snapshot from whenever it was last rendered, not necessarily this exact moment.

Domain registration (WHOIS / RDAP)

RDAP lookup failed (HTTP 429).

How to read WHOIS and RDAP data

SSL certificate

Certificate Transparency lookup failed (HTTP 429).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=utf-8
Cache-Control
no-cache, no-store, max-age=0, must-revalidate
Content-Encoding
Not sent

Security

Content-Security-Policy
base-uri 'self';object-src 'none';report-uri /_/view/cspreport;script-src 'report-sample' 'nonce-NPbfLI9qQ3d7E3ItZIXxAw' 'unsafe-inline' 'unsafe-eval';worker-src 'self';frame-ancestors https://google-admin.corp.google.com/
Strict-Transport-Security
Not sent
X-Frame-Options
DENY
X-Content-Type-Options
nosniff
Referrer-Policy
origin
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://j-code.org/HTTP 301

    → https://www.j-code.org/

  2. 2.https://www.j-code.org/HTTP 200

Meta tags

Title
プログラミング教育研究所
Description
Not set
Canonical
Not set
Robots
noindex
Generator
Not set
Open Graph title
プログラミング教育研究所
Open Graph description
NPO法人プログラミング教育研究所は、「すべての子供たちにプログラミング教育の機会を」という思いのもと、プログラミング教室を開いたり、学校や子供食堂での教室開催をサポートしたり、子どもたちが楽しく学べる教材を開発したりしています。 プログラミングに興味がある人も、これから始めたい人も、ぜひ参加して一緒に学びましょう！
Open Graph image
https://lh7-us.googleusercontent.com/sitesv-images-rt/AMxu72uf7LjkMcJ1kZdhfk_StuHITSF85lfyIcaBXrzcJ_uYtw4LhS5Gwv-wlwURBXCE7CO2iPoo4yUM4f1W_31fYYspWDWKUmJj46p1JtwAUw9xhFsbmEvhENvfjJndMluhAeivMV30qf79Oz1tLMcYwvEWCJN7oMWuQJ8ptpFFELSV8jCIxCwAAeKwZXM8XAw=w16383
Open Graph type
website
Twitter card
Not set
Twitter title
Not set
Twitter image
Not set

robots.txt

j-code.org has no robots.txt.

Technology detected

Best-effort, based on a small set of well-known signals — this may be incomplete.

  • Cloudflarecdn

    Server: cloudflare

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