atcoder.jp
AtCoder

!No H1 Tag

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

No Keywords

Technical Rating

XSS attack - not protected. HTTP header "X-XSS-Protection" not found

User Interface redress attack - not protected. HTTP header "X-Frame-Options" not found

HTTP request response - 200

HTTPS request response - 200

Redirect from HTTP to HTTPS

iHTTP redirect: https://atcoder.jp:443/

!Server response time 2,183 sec

HTML load time 1,177 sec

iHTML length: 28783

A link to a favicon is specified

iNumber of IMGs: 23

!The ALT attribute is not set for all IMGs

Adapted for mobile devices. It uses the VIEWPORT tag

!W3C Validation. Number of HTML errors: 38

W3C Validation. Number of HTML warnings: 3

Uses robots.txt

!Doesn't use a sitemap

DNS MX record is available. Anti-spam DMARC and ADSP records are available

Exact physical location of Atcoder.jp

iUS Seattle 410 Terry Ave N.

Amazon.com Invictus, 410, Terry Avenue North, South Lake Union, Belltown, Seattle, King County, Washington, 98109-5210, United States

Technical Information

iServer: nginx

iIPv4: 52.199.250.173, 54.250.110.78

iDNS TXT Records: "pardot884953=58ccd91e72a6f94be7450fef89ee32f712f9e18afb5273954e7d09781c220ec1"
"v=spf1 a:atcoder.jp a:api.atcoder.jp +ip4:183.177.145.0/28 include:_spf.google.com include:aspmx.pardot.com ?all"

iDNS Mail Records: 10 aspmx.l.google.com., 20 alt1.aspmx.l.google.com., 20 alt2.aspmx.l.google.com., 30 aspmx2.googlemail.com., 30 aspmx3.googlemail.com., 30 aspmx4.googlemail.com., 30 aspmx5.googlemail.com.

iDMARC Mail Anti Spam Records: 52.199.250.173, 54.250.110.78

iAuthor Domain Signing Practices Mail Records: 54.250.110.78, 52.199.250.173

iRaw Whois Information

[Querying whois.jprs.jp]
[whois.jprs.jp]
[ 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:
[Domain Name]                   ATCODER.JP

[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]

[Created on]                    2014/11/15
[Expires on]                    2021/11/30
[Status]                        Active
[Last Updated]                  2020/12/01 01:05:08 (JST)

Contact Information:
[Name]                          Whois Privacy Protection Service by VALUE-DOMAIN
[Email]                         [email protected]
[Web Page]                      https://www.value-domain.com/
[Postal code]                   530-0011
[Postal Address]
[Phone]                         06-7634-2727
[Fax]                           06-6374-0121

iRaw IPv4 Information 52.199.250.173

[Querying whois.arin.net]
[whois.arin.net]

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2021, American Registry for Internet Numbers, Ltd.
#



# start

NetRange:       52.192.0.0 - 52.223.191.255
CIDR:           52.223.0.0/17, 52.223.128.0/18, 52.208.0.0/13, 52.192.0.0/12, 52.216.0.0/14, 52.220.0.0/15, 52.222.0.0/16
NetName:        AT-88-Z
NetHandle:      NET-52-192-0-0-1
Parent:         NET52 (NET-52-0-0-0-0)
NetType:        Direct Allocation
OriginAS:
Organization:   Amazon Technologies Inc. (AT-88-Z)
RegDate:        2015-09-02
Updated:        2020-09-24
Ref:            https://rdap.arin.net/registry/ip/52.192.0.0



OrgName:        Amazon Technologies Inc.
OrgId:          AT-88-Z
Address:        410 Terry Ave N.
City:           Seattle
StateProv:      WA
PostalCode:     98109
Country:        US
RegDate:        2011-12-08
Updated:        2021-07-28
Comment:        All abuse reports MUST include:
Comment:        * src IP
Comment:        * dest IP (your IP)
Comment:        * dest port
Comment:        * Accurate date/timestamp and timezone of activity
Comment:        * Intensity/frequency (short log extracts)
Comment:        * Your contact details (phone and email) Without these we will be unable to identify the correct owner of the IP address at that point in time.
Ref:            https://rdap.arin.net/registry/entity/AT-88-Z


OrgAbuseHandle: AEA8-ARIN
OrgAbuseName:   Amazon EC2 Abuse
OrgAbusePhone:  +1-206-266-4064
OrgAbuseEmail:  [email protected]
OrgAbuseRef:    https://rdap.arin.net/registry/entity/AEA8-ARIN

OrgRoutingHandle: IPROU3-ARIN
OrgRoutingName:   IP Routing
OrgRoutingPhone:  +1-206-266-4064
OrgRoutingEmail:  [email protected]
OrgRoutingRef:    https://rdap.arin.net/registry/entity/IPROU3-ARIN

OrgTechHandle: ANO24-ARIN
OrgTechName:   Amazon EC2 Network Operations
OrgTechPhone:  +1-206-266-4064
OrgTechEmail:  [email protected]
OrgTechRef:    https://rdap.arin.net/registry/entity/ANO24-ARIN

OrgNOCHandle: AANO1-ARIN
OrgNOCName:   Amazon AWS Network Operations
OrgNOCPhone:  +1-206-266-4064
OrgNOCEmail:  [email protected]
OrgNOCRef:    https://rdap.arin.net/registry/entity/AANO1-ARIN

OrgRoutingHandle: ARMP-ARIN
OrgRoutingName:   AWS RPKI Management POC
OrgRoutingPhone:  +1-206-266-4064
OrgRoutingEmail:  [email protected]
OrgRoutingRef:    https://rdap.arin.net/registry/entity/ARMP-ARIN

# end


# start

NetRange:       52.196.0.0 - 52.199.255.255
CIDR:           52.196.0.0/14
NetName:        AMAZON-NRT
NetHandle:      NET-52-196-0-0-1
Parent:         AT-88-Z (NET-52-192-0-0-1)
NetType:        Reallocated
OriginAS:       AS16509
Organization:   Amazon Data Services Japan (AMAZO-49)
RegDate:        2015-12-10
Updated:        2015-12-10
Ref:            https://rdap.arin.net/registry/ip/52.196.0.0


OrgName:        Amazon Data Services Japan
OrgId:          AMAZO-49
Address:        11F Shibuya Cross Tower
Address:        2-15-1, Shibuya-ku Shibuya
City:           Tokyo
StateProv:
PostalCode:     150-0002
Country:        JP
RegDate:        2012-08-01
Updated:        2014-07-01
Comment:        The activity you have detected originates from a dynamic hosting environment.
Comment:        For fastest response, please submit abuse reports at http://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/AWSAbuse
Comment:        For more information regarding EC2 see:
Comment:        http://ec2.amazonaws.com/
Comment:        All reports MUST include:
Comment:        * src IP
Comment:        * dest IP (your IP)
Comment:        * dest port
Comment:        * Accurate date/timestamp and timezone of activity
Comment:        * Intensity/frequency (short log extracts)
Comment:        * Your contact details (phone and email) Without these we will be unable to identify the correct owner of the IP address at that point in time.
Ref:            https://rdap.arin.net/registry/entity/AMAZO-49


OrgNOCHandle: AANO1-ARIN
OrgNOCName:   Amazon AWS Network Operations
OrgNOCPhone:  +1-206-266-4064
OrgNOCEmail:  [email protected]
OrgNOCRef:    https://rdap.arin.net/registry/entity/AANO1-ARIN

OrgAbuseHandle: AEA8-ARIN
OrgAbuseName:   Amazon EC2 Abuse
OrgAbusePhone:  +1-206-266-4064
OrgAbuseEmail:  [email protected]
OrgAbuseRef:    https://rdap.arin.net/registry/entity/AEA8-ARIN

OrgTechHandle: ANO24-ARIN
OrgTechName:   Amazon EC2 Network Operations
OrgTechPhone:  +1-206-266-4064
OrgTechEmail:  [email protected]
OrgTechRef:    https://rdap.arin.net/registry/entity/ANO24-ARIN

# end



#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2021, American Registry for Internet Numbers, Ltd.
#

iRaw DNS Information

A: 52.199.250.173
A: 54.250.110.78

TXT: "pardot884953=58ccd91e72a6f94be7450fef89ee32f712f9e18afb5273954e7d09781c220ec1"
TXT: "v=spf1 a:atcoder.jp a:api.atcoder.jp +ip4:183.177.145.0/28 include:_spf.google.com include:aspmx.pardot.com ?all"

MX: 10 aspmx.l.google.com.
MX: 20 alt1.aspmx.l.google.com.
MX: 20 alt2.aspmx.l.google.com.
MX: 30 aspmx2.googlemail.com.
MX: 30 aspmx3.googlemail.com.
MX: 30 aspmx4.googlemail.com.
MX: 30 aspmx5.googlemail.com.

DMARC: 52.199.250.173
DMARC: 54.250.110.78

ADSP: 54.250.110.78
ADSP: 52.199.250.173