Atcoder.jp AtCoder

AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.

Online Status
Online

Server IP address resolved: Yes
Http response code: 200
Response time: 0.78 sec.
Last Checked: 09/28/2021

Over the time atcoder.jp has been ranked as high as 4,284 in the world, while most of its traffic comes from Japan, where it reached as high as 6,360 position.

Atcoder.jp receives about 443 unique visitors and 6,202 pageviews per day. The estimated value of atcoder.jp is 105,120 USD. Each unique visitor makes about 14 pageviews on average.

Atcoder.jp is registered under .JP top-level domain. Check other websites in .JP zone.

At the time of the last check (November 24, 2019) atcoder.jp has an expired SSL certificate issued by Amazon (expired on June 26, 2020). Check other websites using SSL certificates issued by Amazon.

According to Google Safe Browsing, Google Safe Search and Symantec atcoder.jp is quite a safe domain.

Mobile-Friendly test indicates that atcoder.jp is well optimized for mobile and tablet devices.


Global Rank
90,449
Average Load Time
0.95sec
Links In Count
179
Website Value
$105,120

Overview
Last Updated: 08/18/2022
Overall result - "atcoder.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: 03/22/2022
atcoder.jp is safe.

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

Google Safe Search
Last Updated: 10/27/2016
atcoder.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
Malware not found at "atcoder.jp".
"atcoder.jp" is not a phishing page.
"atcoder.jp" does not install unwanted software.
"atcoder.jp" does not contain harmfull applications.
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: 02/24/2021
atcoder.jp is safe.

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

Web of Trust
Last Updated: 08/18/2022
atcoder.jp child safety isunknown.

The WOT calculates reputation of the atcoder.jp. This reputation system receives ratings from users and information from third-party sources, assesses the atcoder.jp for safety features and confirms, whether atcoder.jp is suitable for children.

SSL Information
Domain atcoder.jp
Issuer OrganizationAmazon
Issuer Amazon
Algorithm RSA-SHA256
Valid form 05/26/2019
Expiration 06/26/2020
SignedCertificate is not self signed
Additional Domains atcoder.jp
Server Location
Tokyo
Tokyo
Japan
ASN Information

ASN ID: 16509
ASN Title: AMAZON-02 - Amazon.com, Inc., US

Last Update: 05/01/2022

#
# 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.
#

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]
[Domain Name] ATCODER.JP

[登録者名] AtCoder Inc.
[Registrant] AtCoder Inc.

[Name Server] ns-96.awsdns-12.com
[Name Server] ns-1144.awsdns-15.org
[Name Server] ns-890.awsdns-47.net
[Name Server] ns-1543.awsdns-00.co.uk
[Signing Key]

[登録年月日] 2014/11/15
[有効期限] 2021/11/30
[状態] Active
[最終更新] 2020/12/01 01:05:08 (JST)

Contact Information: [公開連絡窓口]
[名前] Whois情報公開代行サービス by バリュードメイン
[Name] Whois Privacy Protection Service by VALUE-DOMAIN
[Email] whoisproxy@value-domain.com
[Web Page] https://www.value-domain.com/
[郵便番号] 530-0011
[住所] 大阪府大阪市北区大深町3-1
グランフロント大阪 タワーB 23階
[Postal Address]
[電話番号] 06-7634-2727
[FAX番号] 06-6374-0121

DNS Records
HostA RecordTTL
atcoder.jp54.64.223.860
atcoder.jp54.249.74.2960
HostMX RecordPriorityTTL
atcoder.jpaspmx.l.google.com10300
atcoder.jpalt1.aspmx.l.google.com20300
atcoder.jpalt2.aspmx.l.google.com20300
atcoder.jpaspmx2.googlemail.com30300
atcoder.jpaspmx3.googlemail.com30300
atcoder.jpaspmx4.googlemail.com30300
atcoder.jpaspmx5.googlemail.com30300
HostNS RecordTTL
atcoder.jpns-1144.awsdns-15.org172800
atcoder.jpns-1543.awsdns-00.co.uk172800
atcoder.jpns-890.awsdns-47.net172800
atcoder.jpns-96.awsdns-12.com172800
HostTXT RecordTTL
atcoder.jpv=spf1 a:atcoder.jp a:api.atcoder.jp +ip4:183.177.145.0/28 include:_spf.google.com ?all300

ns-96.awsdns-12.com
TTL: 900
Email address: awsdns-hostmaster.amazon.com
Serial: 1
Refresh: 7200
Retry: 900
Expire: 1209600
Minimum: 86400

Errors
Warnings

Last tested: 01/28/2019

Desktop
Desktop Speed
79%
Desktop Resource Breakdown
Total Resources46
Number of Hosts9
Static Resources28
JavaScript Resources16
CSS Resources4

Last tested: 01/28/2019

Mobile
Mobile Usability
94%
Mobile Speed
60%
Mobile Resource Breakdown
Total Resources46
Number of Hosts9
Static Resources28
JavaScript Resources16
CSS Resources4
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