D21.co.jp ディスカヴァー・トゥエンティワン
「視点を変える、明日を変える」ディスカヴァーの公式サイトです。書籍、プロフェッショナルが愛用する手帳、オーディオブック・映像などのデジタルコンテンツを提供しています。
D21.co.jp Overview
D21.co.jp ranking shows that the page is at position 413,605 over the world, while the bulk of its audience is from Japan, where it ranks 35,168.
In terms of rank-to-traffic ratio, d21.co.jp has 519 unique users per day, viewing 1,730 pages. The rank based value of d21.co.jp is 23,676 USD. Every user makes 3.53 pageviews on average.
D21.co.jp boasts a link base consisting of 504 referring domains and 760 external backlinks, as revealed by the data obtained from web network scanning.
D21.co.jp top-level domain belongs to .JP domain zone. Check other webpages in .JP zone.
According the last verification test in June 17, 2023, d21.co.jp has an expired SSL certificate issued by Japan Registry Services Co., Ltd. (expired on December 31, 2023). Click button “Update” SSL Information at the Safety Information section. Check the list of websites using SSL by Japan Registry Services Co., Ltd..
Relying on data from Web of Trust d21.co.jp is probably an unsafe domain.
According the Mobile-Friendly test by Google d21.co.jp is nice optimized for mobile devices and tablets, however the webpage speed could be improved.
D21.co.jp Rank Summary
Audience Geography. Where are d21.co.jp visitors located?
| Country | Visitors |
|---|---|
 Japan JP | 97.5% |
| Other | 2.5% |
| Country | Pageviews |
|---|---|
| Japan JP | 98.8% |
| Other | 1.2% |
| Country | Rank |
|---|---|
| Japan JP | 35168 |
Where do visitors go on d21.co.jp?
| Subdomain | Pageviews |
|---|---|
| d21.co.jp | 100% |
| Subdomain | Pageviews per User |
|---|---|
| d21.co.jp | 4 |
| Subdomain | Reach |
|---|---|
| d21.co.jp | 100% |
How popular is d21.co.jp?
| Period | Global Rank | Global Rank Delta |
|---|---|---|
| past 3 months | 413605 | -471042 |
| past month | 384804 | 10152 |
| past week | 614680 | -5749 |
| Days | Pageviews Rank | Pageviews Rank Delta | Pageviews per Million | Pageviews per Million Delta | Pageviews per User | Pageviews per User Delta |
|---|---|---|---|---|---|---|
| 90 | 396250 | -833931 | 9 | 400% | 3.3 | 100% |
| 30 | 336398 | -26616 | 12 | 8% | 4 | 20% |
| 7 | 718669 | -266670 | 4 | 60% | 2 | 100% |
| Days | Reach Rank | Reach Rank Delta | Reach per Million | Reach per Million Delta |
|---|---|---|---|---|
| 90 | 450171 | -333618 | 1 | 100% |
| 30 | 438474 | 28726 | 1 | -10.12% |
| 7 | 616383 | 118459 | 8 | -21.79% |
D21.co.jp Website Safety
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 d21.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 d21.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 d21.co.jp for mature or inappropriate content, only security checks are evaluated.
The WOT calculates reputation of the d21.co.jp. This reputation system receives ratings from users and information from third-party sources, assesses the d21.co.jp for safety features and confirms, whether d21.co.jp is suitable for children.
| Domain | d21.co.jp |
| Issuer Organization | Japan Registry Services Co., Ltd. |
| Issuer | JPRS Organization Validation Authority - G4 |
| Algorithm | RSA-SHA256 |
| Valid form | 12/01/2022 |
| Expiration | 12/31/2023 |
| Signed | Certificate is not self signed |
| Additional Domains |
d21.co.jp www.d21.co.jp |
D21.co.jp Rank History
Alexa Rank shows how popular d21.co.jp is in comparison with other sites. The most popular site has Alexa Rank equals 1. If d21.co.jp has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to d21.co.jp and pageviews on d21.co.jp over the past 3 months.
D21.co.jp Hosting Information
ASN ID: 16509
ASN Title: AMAZON-02 - Amazon.com, Inc., USLast Update: 07/31/2024
#
# 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: 16509
ASName: AMAZON-02
ASHandle: AS16509
RegDate: 2000-05-03
Updated: 2012-03-02
Ref: https://rdap.arin.net/registry/autnum/16509
OrgName: Amazon.com, Inc.
OrgId: AMAZON-4
Address: 1918 8th Ave
City: SEATTLE
StateProv: WA
PostalCode: 98101-1244
Country: US
RegDate: 1995-01-23
Updated: 2017-01-28
Ref: https://rdap.arin.net/registry/entity/AMAZON-4
OrgAbuseHandle: AEA8-ARIN
OrgAbuseName: Amazon EC2 Abuse
OrgAbusePhone: +1-206-266-4064
OrgAbuseEmail: abuse@amazonaws.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/AEA8-ARIN
OrgTechHandle: ANO24-ARIN
OrgTechName: Amazon EC2 Network Operations
OrgTechPhone: +1-206-266-4064
OrgTechEmail: amzn-noc-contact@amazon.com
OrgTechRef: https://rdap.arin.net/registry/entity/ANO24-ARIN
RTechHandle: AC6-ORG-ARIN
RTechName: Amazon-com Incorporated
RTechPhone: +1-206-266-2187
RTechEmail: ipmanagement@amazon.com
RTechRef: https://rdap.arin.net/registry/entity/AC6-ORG-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.
#
D21.co.jp Domain Registration and Settings
[ 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] D21.CO.JP
e. [そしきめい] かぶしきがいしゃ でぃすかう゛ぁー・とぅえんてぃわん
f. [組織名] 株式会社ディスカヴァー・トゥエンティワン
g. [Organization] Discover 21,Inc.
k. [組織種別] 株式会社
l. [Organization Type] corporation
m. [登録担当者] SF34488JP
n. [技術連絡担当者] SF34465JP
p. [ネームサーバ] ns-904.awsdns-49.net
p. [ネームサーバ] ns-1769.awsdns-29.co.uk
p. [ネームサーバ] ns-1456.awsdns-54.org
p. [ネームサーバ] ns-472.awsdns-59.com
s. [署名鍵]
[状態] Connected (2025/05/31)
[登録年月日] 1996/05/24
[接続年月日] 1996/07/22
[最終更新] 2024/06/01 01:02:34 (JST)
| Host | A Record | TTL |
|---|
| Host | MX Record | Priority | TTL |
|---|
| Host | NS Record | TTL |
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| Host | TXT Record | TTL |
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D21.co.jp HTML Check
D21.co.jp Desktop Performance
Last tested: 08/10/2017
| Total Resources | 73 |
| Number of Hosts | 7 |
| Static Resources | 63 |
| JavaScript Resources | 10 |
| CSS Resources | 4 |
D21.co.jp Mobile Insights
Last tested: 05/22/2017
| Total Resources | 72 |
| Number of Hosts | 7 |
| Static Resources | 62 |
| JavaScript Resources | 10 |
| CSS Resources | 4 |
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