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Coursera.org Coursera | Online Courses & Credentials by Top Educators. Join for Free

Learn online and earn credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for fr...

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Online Status
Offline

Server IP address resolved: No
Http response code: None
Last Checked: 09/16/2019

Coursera.org receives about three hundred thousand unique visitors and nine hundred thousand pageviews per day. The estimated value of coursera.org is ten million USD. Each unique visitor makes about 3.6 pageviews on average.

Over the time coursera.org has been ranked as high as 416 in the world, while most of its traffic comes from India, where it reached as high as 280 position.

coursera.org is hosted by AMAZON-02 - Amazon.com, Inc., US in United States, but we recommend to move server to India, as it will speed up coursera.org page load time for the majority of their users. See the list of other websites hosted by AMAZON-02 - Amazon.com, Inc., US.

Coursera.org is registered under .ORG top-level domain. Check other websites in .ORG zone.

At the time of the last check (July 04, 2019) coursera.org has an expired SSL certificate (expired on October 21, 2019).

According to Google Safe Browsing, Google Safe Search, Symantec and Web of Trust coursera.org is quite a safe domain.

Mobile-Friendly test indicates that coursera.org is well optimized for mobile and tablet devices, however website page loading time could be improved.

Global Rank
755
Average Load Time
3.59sec
Links In Count
2,848
Website Value
$11.8 M
Overview
Last Updated: 11/19/2019
Overall result - "coursera.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: 01/12/2019
NCS "coursera.org" OK.

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

Google Safe Search
Last Updated: 10/10/2016
GSS "coursera.org" OK.

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: 02/18/2019
Malware not found at "coursera.org".
"coursera.org" is not a phishing page.
"coursera.org" does not install unwanted software.
"coursera.org" 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: 01/09/2019
SA "coursera.org" OK.

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

Web of Trust
Last Updated: 01/09/2019
WOT "coursera.org" VERY GOOD.

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

SSL Information
Domain coursera.org
Issuer Organization Unknown
Issuer Amazon
Algorithm RSA-SHA256
Valid form 09/21/2018
Expiration 10/21/2019
Signed Certificate is not self signed
Additional Domains coursera.org
*.coursera.org
Server Location
Seattle
Washington
United States
ASN Information

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

Last Update: 05/29/2019

#
# 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.
#

HTML Metatags
Title
Coursera | Online Courses & Credentials by Top Educators. Join for Free
The title is too long, search engines may need to shorten it in the search results and your keywords may not appear on the search results page. You should try to keep the length of the title somewhere between at least 10 characters and 70 characters.
Description
Learn online and earn credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for free and transform your career with degrees, certificates, Specializations, & MOOCs in data science, computer science, business, and dozens of other topics.
The description has optimal length. Keep in mind that the "optimal" length will vary depending on the situation, and your primary goal should be to provide value and drive clicks.
Encoding
UTF-8
You should always specify the encoding used for an HTML page. If you don't, you risk that characters in your content are incorrectly interpreted. This is not just an issue of human readability, increasingly machines need to understand your data too.
Language
en English
Identifying the language of your content allows you to automatically do a number of things, from changing the look and behavior of a page, to assisting search engines in extracting information. If part of the page uses text in a different language, you can add a language attribute with a different value to the element that surrounds that content.
Language Region
Not Found
Images
Attribute ALT
Line 232, ...<img src="https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/...
Line 232, ...<img src="https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/...
As a general rule, search engines do not interpret the content of image files. The text provided in the <img alt> attribute enables the site owner to provide relevant information to the search engine and to the end user.
H1-H6 Tags Information

For search engines, <H> tags helps understand the structure of the text on a page better. For users, headings are like anchors in a wall of text, navigating them through the page and making it easier to digest. The <h1> tag reinforces the core keyword(s) found in the <title>, <description>, and the <body>. We recommend that the <h1> tag includes keywords that reflect the contents of the page and that it is not longer than 150 characters in length, but don’t overuse the tags and the keywords in them. Keep it readable for users.

H1
Line 232, ...<h1 class="m-a-0 body" data-reactid="53"><a data-click-key="commo...
Line 232, ...<h1 class="display-5-text headline" data-elementtiming="frontpage...
Line 232, ...<h1 class="display-4-text headline color-primary-text" data-eleme...
Line 235, ...<h1 class="banner-heading headline-4-text bold" data-reactid="203...
Line 239, ...<h1 class="subFooter__content__heading" data-reactid="324"><span ...
Your H1 introduces the topic your page is all about, just as a title tells a reader what a book is all about. Remove redundant H1 tags from the page source, so that only one H1 tag exists.
H2
8 H2 tag(s).
The H2s are akin to book chapters, describing the main topics you’ll cover in sections of the article.
H3
6 H3 tag(s).
Subsequent headers, H3s to H6s, serve as additional sub-headings within each section, just as a book chapter may be split up by multiple sub-topics.
H4
H5
3 H5 tag(s).
H6
Iframes Information
iFrame
iFrames not found.
Since search engines consider the content in iframes to belong to another website, the best you can hope for is no effect on SEO. Iframes tend to neither help nor hurt your search engine ranking. For this reason, it’s best to refrain from using iframes on main pages that you want to rank high in search engine results. Instead, fill high-priority pages with useful, unique content and save iframes for other pages.
Code To Text Ratio
Code To Text Ratio
0.85 %
A good code to text ratio is anywhere from 25 to 70 percent. This percentage refers to the visible text ratio, as opposed to HTML elements, image tags and other non-visible information. This has become especially apparent since search engines, such as Google, released the Panda update which placed importance on content-driven sites.
Favicons

Favicons are the little piece of graphic that represents your brand on browser tabs, bookmark lists, search history, search ads and even search results. These files are placed in a file called favicon.ico and placed in the root directory of a website. There are no direct SEO effects of having favicons. However, there may be indirect benefits such as increased usability of site and bookmarks. It makes your website look more professional and help a users to remember your site while browsing through multiple URLs. If you want to get mentioned benefits you have to specify icons for different web browsers and sometimes even for different mobiles.

Default Favicon
default, favicon.ico
Backup icon for most desktop browsers (if no icon of the right size is found). Tag format <link rel="shortcut icon" href="path-to-16x16-icon.ico" type="image/x-icon" />
16x16 Optional Favicon
Line 1, https://d3njjcbhbojbot.cloudfront.net/web/images/favicons/icon-blue-16x16.png
Standard icon for outdated browsers or small resolution hand held devices. Tag format <link rel="icon" type="image/png" sizes="16x16" href="path-to-16x16.png">
32x32 Optional Favicon
Line 1, https://d3njjcbhbojbot.cloudfront.net/web/images/favicons/icon-blue-32x32.png
Standard for most desktop browsers. Tag format <link rel="icon" sizes="32x32" href="path-to-32x32.png">
96x96 Optional Favicon
Line 1, https://d3njjcbhbojbot.cloudfront.net/web/images/favicons/icon-blue-96x96.png
Mostly used as GoogleTV icon. Tag format <link rel="icon" type="image/png" sizes="96x96" href="path-to-96x96.png">
Default Apple Icon
Backup icon for apple devices (if no icon of the right size is found). Preferrable size 60x60. Tag format <link rel="apple-touch-icon" sizes="72x72" href="path-to-small-icon.png">
180x180 Apple Icon
Line 1, https://d3njjcbhbojbot.cloudfront.net/web/images/favicons/apple-touch-icon-180x180.png
iPhone 6 plus icons. Tag format <link rel="apple-touch-icon" sizes="180x180" href="path-to-180x180.png">
152x152 Apple Icon
Line 1, https://d3njjcbhbojbot.cloudfront.net/web/images/favicons/apple-touch-icon-152x152.png
iPad, iPad mini icons. Tag format <link rel="apple-touch-icon" sizes="152x152" href="path-to-icon-152x152.png">
167x167 Apple Icon
iPad Pro icon. Tag format <link rel="apple-touch-icon" sizes="167x167" href="path-to-167x167.png">
Robots.txt Information

Robots.txt is a text file that website owners can create to tell search engine bots how to crawl and index pages on their site.

Robots File
Robots File Loaded successfully (/robots.txt)
You can have multiple lines of instructions to allow or disallow specific URLs and add multiple sitemaps. If you do not disallow a URL, then search engine bots assume that they are allowed to crawl it.
Disallow
17 record(s)
Other User-Agent
Not found
Default User-Agent
1 record(s)
Sitemap

A sitemap is an XML file where is provided information about each URL: when it was last updated, how often it changes, and how important it is in relation to other URLs in the site. Search engines crawling bots read this file to more efficiently and intelligently crawl your site and to find URLs that may be isolated from rest of the site's content.

Sitemap Found At robots.txt
Loaded successfully
Using a sitemap doesn't guarantee that all the items in your sitemap will be crawled and indexed, however, your site will benefit from having a sitemap.
WHOIS

Domain Name: COURSERA.ORG
Registry Domain ID: D164365199-LROR
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.whois.godaddy.com
Updated Date: 2013-07-02T20:07:35Z
Creation Date: 2012-01-12T01:57:48Z
Registry Expiry Date: 2023-01-12T01:57:48Z
Registrar Registration Expiration Date:
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: abuse@godaddy.com
Registrar Abuse Contact Phone: +1.4806242505
Reseller:
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Registrant Organization: Coursera Inc
Registrant State/Province: California
Registrant Country: US
Name Server: NS-1481.AWSDNS-57.ORG
Name Server: NS-1590.AWSDNS-06.CO.UK
Name Server: NS-258.AWSDNS-32.COM
Name Server: NS-688.AWSDNS-22.NET
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form https://www.icann.org/wicf/)
>>> Last update of WHOIS database: 2019-10-01T13:45:04Z

DNS Records
HostA RecordTTL
coursera.org13.33.231.9060
coursera.org13.33.231.4760
coursera.org13.33.231.1360
coursera.org13.33.231.5860
HostMX RecordPriorityTTL
coursera.orgaspmx.l.google.com10300
coursera.orgalt1.aspmx.l.google.com20300
coursera.orgalt2.aspmx.l.google.com20300
coursera.orgaspmx2.googlemail.com30300
coursera.orgaspmx3.googlemail.com30300
coursera.orgaspmx4.googlemail.com30300
coursera.orgaspmx5.googlemail.com30300
HostNS RecordTTL
coursera.orgns-1481.awsdns-57.org172800
coursera.orgns-1590.awsdns-06.co.uk172800
coursera.orgns-258.awsdns-32.com172800
coursera.orgns-688.awsdns-22.net172800
HostTXT RecordTTL
coursera.org376174617-1005669460
coursera.orgMS=ms9165742160
coursera.orgatlassian-domain-verification=OwoxnU5JeeEeNB3PXqTmPOsZNFUYTd05tar4PX8ZNNjps+mMWto+OyyA/50W5+B160
coursera.orgatlassian-domain-verification=pwnyCbGEmC6E08lYJGO/SYkQvbjFS+OXy03eVMG75U52Edj0vbZGBjdaorxh+PUE60
coursera.orgdocusign=05d7ee1b-a029-4b94-912a-25bb3c4a2bed60
coursera.orggoogle-site-verification=61uiBFuqY-MYJHWt_8qbU00Rsn7Nq_njU5eMUG0NlrY60
coursera.orggoogle-site-verification=874wxzrE4FAJO81XTCXyH6WYnWZAMdlbMRXI3lfI0bw60
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coursera.orggoogle-site-verification=tbpsWy5oBEvo-Kod36Lqsb3qRK0h_divcCGAeUdVZlk60
coursera.orgspf2.0/pra include:amazonses.com include:sendgrid.net include:_spf.google.com include:spf.mtasv.net -all60
coursera.orgv=spf1 include:sendgrid.net ip4:24.6.102.21 ip4:54.83.204.127 ip4:50.16.53.44 include:_spf.google.com include:mail.focal360.com include:amazonses.com include:spf.mtasv.net -all60

ns-1590.awsdns-06.co.uk
TTL: 900
Email address: awsdns-hostmaster.amazon.com
Serial: 1
Refresh: 7200
Retry: 900
Expire: 1209600
Minimum: 86400

Errors
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Warnings
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Last tested: 06/12/2016

Desktop
Desktop Speed
74%
Your page has 1 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.Optimize CSS Delivery of the following:

https://d3njjcbhbojbot.cloudfront.net/web/1d01d1d7…ront-page/styl/all.css

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.

http://coursera.org/
https://coursera.org/
https://www.coursera.org/

In our test, your server responded in 0.34 seconds. There are many factors that can slow down your server response time. Please read our recommendations to learn how you can monitor and measure where your server is spending the most time.
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:

https://bat.bing.com/bat.js (expiration not specified)
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (10 minutes)
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (10 minutes)
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (10 minutes)
https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer (16.3 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
https://www.coursera.org/suggestions.json (24 hours)

Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 30.5KiB (49% reduction).

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Losslessly compressing https://d3njjcbhbojbot.cloudfront.net/web/1d01d1d7…_generic_rgb_wo_45.png could save 3.8KiB (48% reduction).

Desktop Resource Breakdown
Total Resources127
Number of Hosts14
Static Resources110
JavaScript Resources48
CSS Resources3

Last tested: 01/31/2018

Mobile
Mobile Usability
95%
The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.
The page content is 427 CSS pixels wide, but the viewport is only 412 CSS pixels wide. The following elements fall outside the viewport:

The element <div class="bt3-col-md-12 c-pua-heading">Masters of Com…- Data Science</div> falls outside the viewport.
The element <div class="bt3-row">Enter the high…uary 15, 2018.</div> falls outside the viewport.
The element <div class="bt3-col-md-12…tton-container">Learn More</div> falls outside the viewport.

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.

The tap target <button class="nostyle promo-dismiss-button"></button> is close to 2 other tap targets final.
The tap target <a href="intent:courser…a.android;end;" class="nostyle banner…lign-items-top">Coursera for A…oid(75000+)GET</a> is close to 1 other tap targets final.
The tap target <div class="rc-PromoBanner">Masters of Com…018.Learn More</div> is close to 1 other tap targets final.
The tap target <a href="https://www.co…r-data-science">Learn More</a> and 1 others are close to other tap targets.
The tap target <a href="/specializatio…gle-it-support" class="card-link nostyle">GoogleGoogle I…Specialization</a> and 6 others are close to other tap targets.
The tap target <button type="button" class="slick-next slick-arrow">Next</button> and 6 others are close to other tap targets.

Mobile Speed
53%
Your page has 1 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.Optimize CSS Delivery of the following:

https://d3njjcbhbojbot.cloudfront.net/webapps/buil…7d872353f64911ead0.css

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.

http://coursera.org/
https://coursera.org/
https://www.coursera.org/

In our test, your server responded in 0.68 seconds. There are many factors that can slow down your server response time. Please read our recommendations to learn how you can monitor and measure where your server is spending the most time.
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:

https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (10 minutes)
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (10 minutes)
https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer (15 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/375767…4666?v=2.8.10&r=stable (20 minutes)
https://connect.facebook.net/signals/config/946401…4875?v=2.8.10&r=stable (20 minutes)
https://bat.bing.com/bat.js (30 minutes)
https://www.googleadservices.com/pagead/conversion_async.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)

Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 9.6KiB (53% reduction).

Compressing https://d3njjcbhbojbot.cloudfront.net/web/images/f…touch-icon-144x144.png could save 5.8KiB (59% reduction).
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Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.
Minify HTML for the following resources to reduce their size by 1,022B (23% reduction).

Minifying https://tags.rd.linksynergy.com/pix/6577?type=pos&…%2Fwww.coursera.org%2F could save 1,022B (23% reduction) after compression.

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.
Minify JavaScript for the following resources to reduce their size by 383B (15% reduction).

Minifying https://tags.rd.linksynergy.com/js/6577/?pt=home could save 383B (15% reduction) after compression.

Mobile Resource Breakdown
Total Resources132
Number of Hosts28
Static Resources84
JavaScript Resources27
CSS Resources1
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