Njkk.co.jp 日本住環境株式会社
高気密・高断熱・冷暖房・計画換気を軸に、高気密・高断熱住宅の発展を追求し、住む人のため、住む人とともに快適な温熱住環境を実現します。
Server IP address resolved: No
Http response code: None
Last Checked: 11/01/2026
Njkk.co.jp attracts 1,659 unique visitors daily, generating 3,317 pageviews. The estimated value of njkk.co.jp is 2,568 USD. Each visitor views approximately 2.14 pages on average.
According to Majestic's traffic estimates, njkk.co.jp ranks 59,842 globally.
Njkk.co.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 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US.
Njkk.co.jp is registered with the .JP top-level domain. Explore additional websites within the .JP zone.
A recent examination on (September 01, 2024), indicates that njkk.co.jp has an expired SSL certificate issued by DigiCert Inc (expired on August 15, 2025). Click the "Refresh" button in the Safety Information section for updated SSL details. See the list of websites using SSL certificates issued by DigiCert Inc.
According to Google Safe Browsing, Google Safe Search and Symantec njkk.co.jp appears to be a safe domain.
Based on Google's Mobile-Friendly test, njkk.co.jp is optimized for mobile and tablet devices, although the web page loading speed could be improved.

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 ConnectSafe evaluates njkk.co.jp for any unsafe and insecure content. The results are critical for families with young children.

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.

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.

McAfee assesses njkk.co.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 njkk.co.jp for mature or inappropriate content, only security checks are evaluated.

The WOT calculates reputation of the njkk.co.jp. This reputation system receives ratings from users and information from third-party sources, assesses the njkk.co.jp for safety features and confirms, whether njkk.co.jp is suitable for children.
| Domain | www.njkk.co.jp |
| Issuer Organization | DigiCert Inc |
| Issuer | RapidSSL TLS RSA CA G1 |
| Algorithm | RSA-SHA256 |
| Valid form | 07/29/2024 |
| Expiration | 08/15/2025 |
| Signed | Certificate is not self signed |
| Additional Domains |
www.njkk.co.jp njkk.co.jp |
ASN ID: 8075
ASN Title: MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US
Last Update: 05/09/2026
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#
ASNumber: 8068 - 8075
ASName: MICROSOFT-CORP-MSN-AS-BLOCK
ASHandle: AS8068
RegDate: 1997-03-31
Updated: 2013-09-04
Ref: https://rdap.arin.net/registry/autnum/8068
OrgName: Microsoft Corporation
OrgId: MSFT
Address: One Microsoft Way
City: Redmond
StateProv: WA
PostalCode: 98052
Country: US
RegDate: 1998-07-09
Updated: 2017-01-28
Comment: To report suspected security issues specific to traffic emanating from Microsoft online services, including the distribution of malicious content or other illicit or illegal material through a Microsoft online service, please submit reports to:
Comment: * https://cert.microsoft.com.
Comment:
Comment: For SPAM and other abuse issues, such as Microsoft Accounts, please contact:
Comment: * abuse@microsoft.com.
Comment:
Comment: To report security vulnerabilities in Microsoft products and services, please contact:
Comment: * secure@microsoft.com.
Comment:
Comment: For legal and law enforcement-related requests, please contact:
Comment: * msndcc@microsoft.com
Comment:
Comment: For routing, peering or DNS issues, please
Comment: contact:
Comment: * IOC@microsoft.com
Ref: https://rdap.arin.net/registry/entity/MSFT
OrgTechHandle: MRPD-ARIN
OrgTechName: Microsoft Routing, Peering, and DNS
OrgTechPhone: +1-425-882-8080
OrgTechEmail: IOC@microsoft.com
OrgTechRef: https://rdap.arin.net/registry/entity/MRPD-ARIN
OrgAbuseHandle: MAC74-ARIN
OrgAbuseName: Microsoft Abuse Contact
OrgAbusePhone: +1-425-882-8080
OrgAbuseEmail: abuse@microsoft.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/MAC74-ARIN
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#
[ 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] NJKK.CO.JP
e. [そしきめい] にほんじゅうかんきょうかぶしきがいしゃ
f. [組織名] 日本住環境株式会社
g. [Organization] JAPAN ENERGY-SAVING HOUSING CO.,LTD
k. [組織種別] 株式会社
l. [Organization Type] corporation
m. [登録担当者] HK57052JP
n. [技術連絡担当者] MK63918JP
p. [ネームサーバ] ns1.infonet.jp
p. [ネームサーバ] ns2.infonet.jp
s. [署名鍵]
[状態] Connected (2022/09/30)
[登録年月日] 2004/09/15
[接続年月日] 2004/09/15
[最終更新] 2021/10/01 01:07:41 (JST)
| Host | A Record | TTL |
|---|---|---|
| njkk.co.jp | 106.187.247.231 | 300 |
| Host | MX Record | Priority | TTL |
|---|---|---|---|
| njkk.co.jp | mail.njkk.co.jp | 10 | 300 |
| Host | NS Record | TTL |
|---|---|---|
| njkk.co.jp | ns4.unit-mse.co.jp | 300 |
| njkk.co.jp | ns3.unit-mse.co.jp | 300 |
| Host | TXT Record | TTL |
|---|---|---|
| njkk.co.jp | v=spf1 +ip4:106.187.247.231 ~all | 300 |
ns3.unit-mse.co.jp
TTL: 300
Email address: root.njkk.co.jp
Serial: 2017051101
Refresh: 84800
Retry: 3600
Expire: 604800
Minimum: 300
Last tested: 01/11/2016

| Total Resources | 106 |
| Number of Hosts | 7 |
| Static Resources | 99 |
| JavaScript Resources | 16 |
| CSS Resources | 7 |
Last tested: 11/08/2019


| Total Resources | 37 |
| Number of Hosts | 5 |
| Static Resources | 33 |
| JavaScript Resources | 7 |
| CSS Resources | 3 |
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