Htdp.org How to Design Programs

Htdp.org Overview

Website Overview: htdp.org - How to Design Programs

htdp.org is a website dedicated to teaching and promoting the principles and techniques of program design. The site provides valuable resources and guidance for individuals interested in learning how to develop efficient and well-structured computer programs.

The website attracts a considerable amount of traffic with 790 unique users per day, averaging around 2212 pageviews. This indicates that there is a steady audience actively engaging with the content provided on htdp.org.

In terms of monetary value, the site is estimated to be worth approximately 39,420 US dollars. This valuation takes into account various factors such as website traffic, quality of content, and potential revenue generation through advertisements or partnerships.

The site is hosted by FASTLY, a renowned hosting provider based in the United States. FASTLY is known for its reliable and high-performance infrastructure, ensuring that htdp.org can handle the incoming traffic efficiently.

The website's domain, htdp.org, has a Top Level Domain (TLD) of .ORG. This TLD is commonly associated with non-profit organizations and educational institutions, indicating that htdp.org is likely to provide educational content rather than commercial services.

The SSL certificate for htdp.org is issued by Internet2, a respected provider of network and security services. This SSL certificate ensures that communication between users and the website is encrypted and secure, protecting sensitive information from unauthorized access.

From a family-friendly perspective, it is reasonable to assume that htdp.org is suitable for all audiences. Given its focus on teaching computer programming, the content is likely to be informative and educational without promoting any inappropriate or unsafe practices.

According to PageSpeed Insights, htdp.org scores an impressive speed of 96, indicating that the website is optimized for fast loading times. This is crucial for providing a smooth and user-friendly browsing experience, ensuring that visitors can access information quickly.

Additionally, htdp.org has 1193 external backlinks, indicating that other websites find the content on htdp.org valuable enough to link to. This demonstrates the reputation and authority of htdp.org within the programming and educational communities.

Overall, htdp.org stands as a valuable resource for individuals looking to learn how to design programs effectively. With its reliable hosting, secure communication, family-friendly content, and high-performance optimization, it offers an enriching experience for its users.

Htdp.org Rank Summary

Global Rank

302,607

Average Load Time

1.79sec

Links In Count

439

Website Value

$39,459

Audience Geography. Where are htdp.org visitors located?

Country	Visitors
United States US	46.1%
Russian Federation RU	1.9%
Other	52.2%

Country	Pageviews
United States US	40.3%
Russian Federation RU	3.7%
Other	55.9%

Country	Rank
United States US	156603
Russian Federation RU	371013

Where do visitors go on htdp.org?

Subdomain	Pageviews
htdp.org	100%

Subdomain	Pageviews per User
htdp.org	2.5

Subdomain	Reach
htdp.org	100%

How popular is htdp.org?

Period	Global Rank	Global Rank Delta
past 3 months	302607	11137
past month	397475	-2592
past week	558777	-14957
yesterday	479344	-60566

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	320744	57402	12	-21.32%	2.8	-25.27%
30	447998	14330	8	-6.677%	2.5	-7.547%
7	473117	-65672	8	30%	4	30%
1	251737	-172827	2	100%	9	100%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	315904	-9194	16	5%
30	405294	-10784	12	0.6%
7	667551	30825	8	8%
1	678633	1011	8	-1.7%

Htdp.org Website Safety

Overview

Last Updated: 11/10/2024

Overall result - htdp.org 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: 03/27/2024

htdp.org is safe.

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

Google Safe Search

Last Updated: 11/23/2016

htdp.org 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

htdp.org is safe.
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.

Site Advisor

Last Updated: 02/26/2021

htdp.org is safe.

McAfee assesses htdp.org 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 htdp.org for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 01/10/2019

htdp.org child safety is very good.

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

SSL Information

SSL Checker Tool

Domain	htdp.org
Issuer Organization	Let's Encrypt
Issuer	R10
Algorithm	RSA-SHA256
Valid form	08/31/2024
Expiration	11/29/2024
Signed	Certificate is not self signed
Additional Domains	htdp.org www.htdp.org

Htdp.org Rank History

Alexa Rank shows how popular htdp.org is in comparison with other sites. The most popular site has Alexa Rank equals 1. If htdp.org 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 htdp.org and pageviews on htdp.org over the past 3 months.

Htdp.org Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 54113

ASN Title: FASTLY - Fastly, US

Last 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
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# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 54113
ASName: FASTLY
ASHandle: AS54113
RegDate: 2011-10-04
Updated: 2012-03-02
Comment: http://www.fastly.com/
Ref: https://rdap.arin.net/registry/autnum/54113

OrgName: Fastly
OrgId: SKYCA-3
Address: PO Box 78266
City: San Francisco
StateProv: CA
PostalCode: 94107
Country: US
RegDate: 2011-09-16
Updated: 2017-03-30
Ref: https://rdap.arin.net/registry/entity/SKYCA-3

OrgNOCHandle: FNO19-ARIN
OrgNOCName: Fastly Network Operations
OrgNOCPhone: +1-415-404-9374
OrgNOCEmail: noc@fastly.com
OrgNOCRef: https://rdap.arin.net/registry/entity/FNO19-ARIN

OrgTechHandle: FRA19-ARIN
OrgTechName: Fastly RIR Administrator
OrgTechPhone: +1-415-404-9374
OrgTechEmail: rir-admin@fastly.com
OrgTechRef: https://rdap.arin.net/registry/entity/FRA19-ARIN

OrgAbuseHandle: ABUSE4771-ARIN
OrgAbuseName: Abuse Account
OrgAbusePhone: +1-415-496-9353
OrgAbuseEmail: abuse@fastly.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE4771-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.
#

Htdp.org Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: htdp.org
Registry Domain ID: 96a838bedf324209bf98a95a3efac1a9-LROR
Registrar WHOIS Server: whois.squarespace.domains
Registrar URL: https://domains.squarespace.com
Updated Date: 2024-05-07T20:11:00Z
Creation Date: 2001-06-29T14:32:48Z
Registry Expiry Date: 2025-06-29T14:32:48Z
Registrar: Squarespace Domains II LLC
Registrar IANA ID: 895
Registrar Abuse Contact Email: abuse-complaints@squarespace.com
Registrar Abuse Contact Phone: +1.6466935324
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registry Registrant ID: REDACTED FOR PRIVACY
Registrant Name: REDACTED FOR PRIVACY
Registrant Organization:
Registrant Street: REDACTED FOR PRIVACY
Registrant City: REDACTED FOR PRIVACY
Registrant State/Province: RI
Registrant Postal Code: REDACTED FOR PRIVACY
Registrant Country: US
Registrant Phone: REDACTED FOR PRIVACY
Registrant Phone Ext: REDACTED FOR PRIVACY
Registrant Fax: REDACTED FOR PRIVACY
Registrant Fax Ext: REDACTED FOR PRIVACY
Registrant Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Registry Admin ID: REDACTED FOR PRIVACY
Admin Name: REDACTED FOR PRIVACY
Admin Organization: REDACTED FOR PRIVACY
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Admin Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Registry Tech ID: REDACTED FOR PRIVACY
Tech Name: REDACTED FOR PRIVACY
Tech Organization: REDACTED FOR PRIVACY
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Tech Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Name Server: ns-cloud-b1.googledomains.com
Name Server: ns-cloud-b4.googledomains.com
Name Server: ns-cloud-b2.googledomains.com
Name Server: ns-cloud-b3.googledomains.com
DNSSEC: signedDelegation
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of WHOIS database: 2024-10-18T23:52:53Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL
htdp.org	128.148.32.110	3600

Host	MX Record	Priority	TTL
htdp.org	aspmx.l.google.com	0	3600
htdp.org	aspmx2.googlemail.com	10	3600
htdp.org	aspmx3.googlemail.com	10	3600
htdp.org	alt1.aspmx.l.google.com	5	3600
htdp.org	alt2.aspmx.l.google.com	5	3600

Host	NS Record	TTL
htdp.org	ns-1106.awsdns-10.org	172800
htdp.org	ns-2035.awsdns-62.co.uk	172800
htdp.org	ns-372.awsdns-46.com	172800
htdp.org	ns-699.awsdns-23.net	172800

Host	TXT Record	TTL
htdp.org	v=spf1 -all	3600

ns-699.awsdns-23.net
TTL: 900
Email address: awsdns-hostmaster.amazon.com
Serial: 1
Refresh: 7200
Retry: 900
Expire: 1209600
Minimum: 86400

Htdp.org HTML Check

HTML Validation Tool

Errors

Quirky doctype. Expected “<!DOCTYPE html>”.

The “bgcolor” attribute on the “body” element is obsolete. Use CSS instead.

The “text” attribute on the “body” element is obsolete. Use CSS instead.

Element “table” not allowed as child of element “p” in this context. (Suppressing further errors from this subtree.)

The “width” attribute on the “table” element is obsolete. Use CSS instead.

The “align” attribute on the “table” element is obsolete. Use CSS instead.

The “bgcolor” attribute on the “table” element is obsolete. Use CSS instead.

The “align” attribute on the “td” element is obsolete. Use CSS instead.

The “font” element is obsolete. Use CSS instead.

The “center” element is obsolete. Use CSS instead.

No “p” element in scope but a “p” end tag seen.

The “align” attribute on the “img” element is obsolete. Use CSS instead.

Bad value “ 10,300,100,400” for attribute “coords” on element “area”: Expected a minus sign or a digit but saw “ ” instead.

Warnings

The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.

Htdp.org Desktop Performance

Last tested: 12/05/2017

Desktop Speed

97%

Leverage browser caching

Optimize images

Desktop Resource Breakdown

Total Resources	4
Number of Hosts	1
Static Resources	3

Htdp.org Mobile Insights

Last tested: 12/03/2017

Mobile Usability

89%

Configure the viewport

Mobile Speed

96%

Leverage browser caching

Optimize images

Mobile Resource Breakdown

Total Resources	4
Number of Hosts	1
Static Resources	3

Htdp.org Common Typos

www.htdp.com
www.htdp.net
www.htdp.org
www.htdp.info
www.htdp.biz
www.htdp.us
www.htdp.mobi
www.tdp.org
www.htdp.org
www.btdp.org
www.hbtdp.org
www.bhtdp.org
www.gtdp.org
www.hgtdp.org
www.ghtdp.org
www.ytdp.org
www.hytdp.org
www.yhtdp.org
www.utdp.org
www.hutdp.org
www.uhtdp.org
www.jtdp.org
www.hjtdp.org
www.jhtdp.org
www.ntdp.org
www.hntdp.org
www.nhtdp.org
www.hdp.org
www.hrdp.org
www.htrdp.org
www.hrtdp.org
www.hfdp.org
www.htfdp.org
www.hftdp.org
www.hgdp.org
www.htgdp.org
www.hydp.org
www.htydp.org
www.htp.org
www.htxp.org
www.htdxp.org
www.htxdp.org
www.htsp.org
www.htdsp.org
www.htsdp.org
www.htep.org
www.htdep.org
www.htedp.org
www.htrp.org
www.htdrp.org
www.htfp.org
www.htdfp.org
www.htcp.org
www.htdcp.org
www.htcdp.org
www.htd.org
www.htdo.org
www.htdpo.org
www.htdop.org
www.htdl.org
www.htdpl.org
www.htdlp.org

Htdp.org How to Design Programs

Htdp.org Overview

Htdp.org Rank Summary

Htdp.org Website Safety

Htdp.org Rank History

Htdp.org Hosting Information

Htdp.org Domain Registration and Settings

Htdp.org HTML Check

Htdp.org Desktop Performance

Htdp.org Mobile Insights

Htdp.org Similar Audits

Htdp.org Common Typos