Johoku.ac.jp 城北学園 城北中学校・高等学校 トップページ | 城北学園 城北中学校・高等学校

東京都板橋区東新町に所在し、中高一貫教育を提供する私立男子中学校・高等学校です。高等学校において、中学校から入学した内部進学の生徒と高等学校から入学した外部進学の生徒との間では、第2学年から混合してクラスを編成する併設混合型中高一貫校。

Online Status
Offline

Server IP address resolved: No
Http response code: None
Last Checked: 11/02/2026

Johoku.ac.jp attracts 591 unique visitors daily, generating 2,363 pageviews. The estimated value of johoku.ac.jp is 42,179 USD. Each visitor views approximately 4.28 pages on average.

According to Majestic's traffic estimates, johoku.ac.jp ranks 10,524 globally.

Johoku.ac.jp server is located in Japan, so we cannot determine if the distance might affect the page load time.

See the list of other websites hosted by SAKURA-A SAKURA Internet Inc., JP.

Johoku.ac.jp is registered with the .JP top-level domain. Explore additional websites within the .JP zone.

A recent examination on (September 10, 2024), indicates that johoku.ac.jp has an expired SSL certificate issued by GlobalSign nv-sa (expired on December 31, 2024). Click the "Refresh" button in the Safety Information section for updated SSL details. See the list of websites using SSL certificates issued by GlobalSign nv-sa.

According to Google Safe Browsing, Google Safe Search, Symantec and Web of Trust johoku.ac.jp appears to be a safe domain.

Based on Google's Mobile-Friendly test, johoku.ac.jp is optimized for mobile and tablet devices.

Global Rank
296,861
Average Load Time
0.48sec
Links In Count
40
Website Value
$39,420
Overview
Last Updated: 11/02/2026
Overall result - johoku.ac.jp is safe.
We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.
Norton Connect Safe
Last Updated: 02/05/2026
johoku.ac.jp is safe.
Norton ConnectSafe evaluates johoku.ac.jp for any unsafe and insecure content. The results are critical for families with young children.
Google Safe Search
Last Updated: 01/25/2017
johoku.ac.jp is safe.
SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.
Google Safe Browsing
Last Updated: 01/09/2019
johoku.ac.jp is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.
Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.
Site Advisor
Last Updated: 01/07/2021
johoku.ac.jp is safe.
McAfee assesses johoku.ac.jp for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze johoku.ac.jp for mature or inappropriate content, only security checks are evaluated.
Web of Trust
Last Updated: 01/11/2019
johoku.ac.jp child safety is very good.
The WOT calculates reputation of the johoku.ac.jp. This reputation system receives ratings from users and information from third-party sources, assesses the johoku.ac.jp for safety features and confirms, whether johoku.ac.jp is suitable for children.

Johoku.ac.jp | SSL Certificate Information
Domainwww.johoku.ac.jp
Issuer OrganizationGlobalSign nv-sa
IssuerGlobalSign GCC R3 DV TLS CA 2020
AlgorithmRSA-SHA256
Valid form11/30/2023
Expiration12/31/2024
SignedCertificate is not self signed
Additional Domains www.johoku.ac.jp
johoku.ac.jp
Server Location

Johoku.ac.jp ASN Information

ASN ID: 7684
ASN Title: SAKURA-A SAKURA Internet Inc., JP

Last Update: 05/10/2026

% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS7467 - AS7722'

as-block: AS7467 - AS7722
descr: APNIC ASN block
remarks: These AS numbers are further assigned by APNIC
remarks: to APNIC members and end-users in the APNIC region
admin-c: HM20-AP
tech-c: HM20-AP
mnt-by: APNIC-HM
mnt-lower: APNIC-HM
last-modified: 2008-09-04T06:40:26Z
source: APNIC

role: APNIC Hostmaster
address: 6 Cordelia Street
address: South Brisbane
address: QLD 4101
country: AU
phone: +61 7 3858 3100
fax-no: +61 7 3858 3199
e-mail: helpdesk@apnic.net
admin-c: AMS11-AP
tech-c: AH256-AP
nic-hdl: HM20-AP
remarks: Administrator for APNIC
notify: hostmaster@apnic.net
mnt-by: MAINT-APNIC-AP
last-modified: 2013-10-23T04:06:51Z
source: APNIC

% Information related to 'AS7660 - AS7691'

as-block: AS7660 - AS7691
descr: JPNIC-2Byte-ASBLOCK-AP
descr: for assignment to JPNIC members
country: JP
admin-c: JNIC1-AP
tech-c: JNIC1-AP
remarks: Authoritative information regarding AS Number
remarks: assignments made from within this block can be
remarks: queried at whois.nic.ad.jp.
remarks: To only display English output,
remarks: add '/e' at the end of command,
remarks: e.g. 'whois -h whois.nic.ad.jp xxx/e'.
mnt-by: APNIC-HM
mnt-lower: MAINT-JPNIC
last-modified: 2017-06-12T03:54:30Z
source: APNIC

role: Japan Network Information Center
address: Urbannet-Kanda Bldg 4F
address: 3-6-2 Uchi-Kanda
address: Chiyoda-ku, Tokyo 101-0047,Japan
country: JP
phone: +81-3-5297-2311
fax-no: +81-3-5297-2312
e-mail: hostmaster@nic.ad.jp
admin-c: JI13-AP
tech-c: JE53-AP
nic-hdl: JNIC1-AP
mnt-by: MAINT-JPNIC
last-modified: 2012-08-28T07:58:02Z
source: APNIC

% Information related to 'AS7684'

aut-num: AS7684
as-name: SAKURA-A
descr: SAKURA Internet Inc.
import: from AS2497 100 accept ANY
import: from AS4703 110 accept ANY
import: from AS7514 110 accept ANY
import: from AS7501 110 accept ANY
export: to AS2497 announce AS7684
export: to AS4703 announce AS7684
export: to AS7514 announce AS7684
export: to AS7501 announce AS7684
country: JP
admin-c: KT749JP
tech-c: KT749JP
tech-c: KW419JP
last-modified: 2007-05-23T21:17:06Z
source: JPNIC

% This query was served by the APNIC Whois Service version 1.88.15-46 (WHOIS-US3)

WHOIS

[ JPRS database provides information on network administration. Its use is ]
[ restricted to network administration purposes. For further information, ]
[ use 'whois -h whois.jprs.jp help'. To suppress Japanese output, add'/e' ]
[ at the end of command, e.g. 'whois -h whois.jprs.jp xxx/e'. ]

Domain Information: [ドメイン情報]
a. [ドメイン名] JOHOKU.AC.JP
e. [そしきめい] がっこうほうじんじょうほくがくえん
f. [組織名] 学校法人 城北学園
g. [Organization] Johoku Gakuen
k. [組織種別] 学校法人
l. [Organization Type] educational foundation
m. [登録担当者] KI1295JP
n. [技術連絡担当者] HY1834JP
p. [ネームサーバ] ns1.rsjpserver.net
p. [ネームサーバ] ns2.rsjpserver.net
s. [署名鍵]
[状態] Connected (2022/12/31)
[登録年月日] 1998/12/14
[接続年月日] 1999/09/10
[最終更新] 2022/01/01 01:06:43 (JST)


DNS Records
HostA RecordTTL
johoku.ac.jp133.18.161.53300
HostMX RecordPriorityTTL
johoku.ac.jpalt2.aspmx.l.google.com53600
johoku.ac.jpalt1.aspmx.l.google.com53600
johoku.ac.jpaspmx.l.google.com13600
johoku.ac.jpaspmx2.googlemail.com103600
johoku.ac.jpaspmx3.googlemail.com103600
HostNS RecordTTL
johoku.ac.jpns2.rsjpserver.net3600
johoku.ac.jpns1.rsjpserver.net3600
HostTXT RecordTTL
johoku.ac.jpgoogle-site-verification=2LJ8hLCmJ1P3mGTrwscaqWmw-EmRbDLTfGzweXf2JQY3600

ns1.rsjpserver.net
TTL: 3600
Email address: jgstc.hsmstc.com
Serial: 1531280402
Refresh: 14400
Retry: 7200
Expire: 2419200
Minimum: 3600

Warnings

Errors

Last tested: 02/12/2019

Desktop
Desktop Speed
83%

Desktop Resource Breakdown
Total Resources12
Number of Hosts5
Static Resources3
JavaScript Resources1
CSS Resources3

Last tested: 02/12/2019

Mobile
Mobile Usability
100%
Mobile Speed
63%

Mobile Resource Breakdown
Total Resources12
Number of Hosts5
Static Resources3
JavaScript Resources1
CSS Resources3
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