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Htdp.org Summary


Htdp.org was created 24 years ago. Receives approximately 102,000 unique visitors per month. Server is located in United States, IP address 104.21.87.201.

Website Info


Creation date 2001-06-29
Expiration date 2021-06-29
Registrar GANDI SAS
Name servers
  1. clyde.ns.cloudflare.com
  2. kate.ns.cloudflare.com
IP address 104.21.87.201
Server located United States
Host name 104.21.87.201

Alexa Traffic Ranks


Global Rank 717,347
Delta (90 Days) -387,817
Most Popular In Country n/a
Country Rank n/a

Whois info


Domain Name: htdp.org
Registry Domain ID: D74020628-LROR
Registrar WHOIS Server: whois.gandi.net
Registrar URL: http://www.gandi.net
Updated Date: 2020-06-05T17:33:49Z
Creation Date: 2001-06-29T10:32:48Z
Registrar Registration Expiration Date: 2021-06-29T14:32:48Z
Registrar: GANDI SAS
Registrar IANA ID: 81
Registrar Abuse Contact Email: abuse@support.gandi.net
Registrar Abuse Contact Phone: +33.170377661
Reseller: 
Domain Status: clientTransferProhibited http://www.icann.org/epp#clientTransferProhibited
Domain Status: 
Domain Status: 
Domain Status: 
Domain Status: 
Registry Registrant ID: REDACTED FOR PRIVACY
Registrant Name: REDACTED FOR PRIVACY
Registrant Organization: How to Design Programs
Registrant Street: REDACTED FOR PRIVACY
Registrant City: REDACTED FOR PRIVACY
Registrant State/Province: 
Registrant Postal Code: REDACTED FOR PRIVACY
Registrant Country: US
Registrant Phone: REDACTED FOR PRIVACY
Registrant Phone Ext: Registrant Fax: REDACTED FOR PRIVACY
Registrant Fax Ext: Registrant Email: fb08125e82572d0d54b7d6e48aa701aa-htd11@contact.gandi.net
Registry Admin ID: SK235-GANDI
Admin Name: Shriram Krishnamurthi
Admin Organization: 
Admin Street: Computer Science Department
 Box 1910, Brown University
Admin City: Providence
Admin State/Province: Rhode Island
Admin Postal Code: 02912
Admin Country: US
Admin Phone: +1.4018637722
Admin Phone Ext: Admin Fax: +1.4018637657
Admin Fax Ext: Admin Email: f139d03b45e5258500ba48098f83a5f2-110164@contact.gandi.net
Registry Tech ID: SK235-GANDI
Tech Name: Shriram Krishnamurthi
Tech Organization: 
Tech Street: Computer Science Department
 Box 1910, Brown University
Tech City: Providence
Tech State/Province: Rhode Island
Tech Postal Code: 02912
Tech Country: US
Tech Phone: +1.4018637722
Tech Phone Ext: Tech Fax: +1.4018637657
Tech Fax Ext: Tech Email: f139d03b45e5258500ba48098f83a5f2-110164@contact.gandi.net
Name Server: CLYDE.NS.CLOUDFLARE.COM
Name Server: KATE.NS.CLOUDFLARE.COM
Name Server: 
Name Server: 
Name Server: 
Name Server: 
Name Server: 
Name Server: 
Name Server: 
Name Server: 
DNSSEC: Unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/

DNS Records


Host Type TTL Data
htdp.org A 300 ip: 104.21.87.201
htdp.org A 300 ip: 172.67.145.240
htdp.org MX 300 pri: 0
target: aspmx.l.google.com
htdp.org MX 300 pri: 10
target: aspmx2.googlemail.com
htdp.org MX 300 pri: 10
target: aspmx3.googlemail.com
htdp.org MX 300 pri: 5
target: alt1.aspmx.l.google.com
htdp.org MX 300 pri: 5
target: alt2.aspmx.l.google.com
htdp.org NS 86400 target: clyde.ns.cloudflare.com
htdp.org NS 86400 target: kate.ns.cloudflare.com
htdp.org SOA 3600 mname: clyde.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2036780857
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 3600
htdp.org TXT 300 txt: v=spf1 -all
htdp.org AAAA 300 ipv6: 2606:4700:3033::ac43:91f0
htdp.org AAAA 300 ipv6: 2606:4700:3035::6815:57c9

HTTP Headers


Date: Thu, 26 Nov 2020 18:18:57 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Set-Cookie: __cfduid=dd99f293bf9bbf0de6d9addc38c7e4d791606414737; expires=Sat, 26-Dec-20 18:18:57 GMT; path=/; domain=.htdp.org; HttpOnly; SameSite=Lax
Last-Modified: Sat, 01 Aug 2020 21:24:14 GMT
Access-Control-Allow-Origin: *
Expires: Thu, 26 Nov 2020 15:46:17 GMT
Cache-Control: max-age=600
X-Proxy-Cache: MISS
X-GitHub-Request-Id: 65A6:891A:1216550:131D51F:5FBFCB71
Via: 1.1 varnish
Age: 371
X-Served-By: cache-cdg20762-CDG
X-Cache: HIT
X-Cache-Hits: 1
X-Timer: S1606414737.315899,VS0,VE1
Vary: Accept-Encoding
X-Fastly-Request-ID: 6bd8b1ac520d8469bc299a3f0cb0bd041ca8a2db
CF-Cache-Status: DYNAMIC
cf-request-id: 06a760b77e0000088fa2bf9000000001
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report?s=65objjQnp%2FG4CK0XGn%2BOgbZDaLMilEX9hLbOvMTDwTDDd7aJLbQjI390QJcN2iApgcr7ljrIZsmULp4JTHjXWct1JkyCOsSicQ%3D%3D"}],"group":"cf-nel","max_age":604800}
NEL: {"report_to":"cf-nel","max_age":604800}
Server: cloudflare
CF-RAY: 5f859d6bfb29088f-CDG
Connection: Close
Proxy-Connection: Close
x-encoded-content-encoding: gzip

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