STACKOVERFLOW.COM Stack Overflow

stackoverflow.com Website Information

Daily Unique Visits: 20,592,787

Daily Page Views: 164,742,296

Income Per Day: $164,742

Estimated Value: $177,921,360

This website is located in United States and is using following IP address 151.101.193.69. See the complete list of popular websites hosted in United States.

stackoverflow.com is registered under .COM top-level domain. Please check other sites in .COM zone.

Website stackoverflow.com is using the following name servers:

  • ns-358.awsdns-44.com
  • ns-1033.awsdns-01.org
  • ns-cloud-e1.googledomains.com
  • ns-cloud-e2.googledomains.com

and is probably hosted by FASTLY - Fastly, US. See the full list of other websites hosted by FASTLY - Fastly, US.

The highest website stackoverflow.com position in Alexa rank database was 35 and the lowest rank position was 86. Current position of stackoverflow.com in Alexa rank database is 74.

Desktop speed score of stackoverflow.com (82/100) is better than the results of 77.31% of other sites and shows that the page is performing great on desktop computers.

Mobile usability score of stackoverflow.com (80/100) is better than the results of 39.54% of other sites and means that the page is mobile-friendly.

Mobile speed score of stackoverflow.com (73/100) is better than the results of 83.3% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

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stackoverflow.com Alexa Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.


stackoverflow.com whois

WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.


Domain Name: STACKOVERFLOW.COM
Registry Domain ID: 108907621_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.name.com
Registrar URL: http://www.name.com
Updated Date: 2015-11-26T17:58:30Z
Creation Date: 2003-12-26T19:18:07Z
Registrar Registration Expiration Date: 2016-12-26T19:18:07Z
Registrar: Name.com, Inc.
Registrar IANA ID: 625
Reseller:
Domain Status: clientTransferProhibited
Registry Registrant ID:
Registrant Name: Sysadmin Team
Registrant Organization: Stack Exchange, Inc.
Registrant Street: 110 William St , Floor 28
Registrant City: New York
Registrant State/Province: NY
Registrant Postal Code: 10038
Registrant Country: US
Registrant Phone: +1.2122328280
Registrant Email: sysadmin-team@stackoverflow.com
Registry Admin ID:
Admin Name: Sysadmin Team
Admin Organization: Stack Exchange, Inc.
Admin Street: 110 William St , Floor 28
Admin City: New York
Admin State/Province: NY
Admin Postal Code: 10038
Admin Country: US
Admin Phone: +1.2122328280
Admin Email: sysadmin-team@stackoverflow.com
Registry Tech ID:
Tech Name: Sysadmin Team
Tech Organization: Stack Exchange, Inc.
Tech Street: 110 William St , Floor 28
Tech City: New York
Tech State/Province: NY
Tech Postal Code: 10038
Tech Country: US
Tech Phone: +1.2122328280
Tech Email: sysadmin-team@stackoverflow.com
Name Server: cf-dns02.stackoverflow.com
Name Server: cf-dns01.stackoverflow.com
DNSSEC: Unsigned Delegation
Registrar Abuse Contact Email: abuse@name.com
Registrar Abuse Contact Phone: +1.1 7203101849
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2016-04-15T10:00:35-06:00

stackoverflow.com server information

Servers Location

stackoverflow.com desktop page speed rank

Last tested: 2016-06-12


Desktop Speed Medium
82/100

stackoverflow.com Desktop Speed Test Quick Summary


priority - 10 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 2 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js
http://cdn.sstatic.net/Js/stub.en.js?v=f1b75fae2d6c

Optimize CSS Delivery of the following:

http://cdn.sstatic.net/Sites/stackoverflow/all.css?v=2ef2a82ae918
http://static.adzerk.net/Extensions/adFeedback.css

priority - 6 Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 53.3KiB (67% reduction).

Compressing http://cdn.sstatic.net/img/share-sprite-new.svg?v=78be252218f3 could save 24.1KiB (70% reduction).
Compressing http://cdn.sstatic.net/Js/stub.en.js?v=f1b75fae2d6c could save 23.5KiB (65% reduction).
Compressing http://cdn.sstatic.net/Sites/stackoverflow/img/sprites.svg?v=8c1c8cba242e could save 5.1KiB (64% reduction).
Compressing http://cdn.sstatic.net/clc/img/jobs/ico-visa-pink.svg?v=15ac224853d9 could save 544B (44% reduction).

priority - 2 Prioritize visible content

Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.

The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.

Only about 64% of the final above-the-fold content could be rendered with the full HTML response.

priority - 2 Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 16KiB (24% reduction).

Losslessly compressing http://cdn.sstatic.net/img/favicons-sprite16.png?v=fc0e36c9a3a2 could save 11KiB (18% reduction).
Losslessly compressing http://i.stack.imgur.com/vobok.png could save 2.6KiB (76% reduction).
Losslessly compressing http://i.stack.imgur.com/EdUwb.png could save 2.4KiB (67% reduction).

priority - 0 Leverage browser caching

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://www.google-analytics.com/analytics.js (2 hours)

priority - 0 Minify JavaScript

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 684B (34% reduction).

Minifying http://static.adzerk.net/Extensions/adFeedback.js could save 684B (34% reduction) after compression.

stackoverflow.com Desktop Resource Breakdown

Total Resources37
Number of Hosts12
Static Resources25
JavaScript Resources10
CSS Resources3

stackoverflow.com mobile page speed rank

Last tested: 2016-06-12


Mobile Speed Medium
73/100

stackoverflow.com Mobile Speed Test Quick Summary


priority - 32 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 3 blocking script resources and 1 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js
http://cdn.sstatic.net/Js/stub.en.js?v=f1b75fae2d6c
http://cdn.sstatic.net/Js/mobile.en.js?v=3199d1e28733

Optimize CSS Delivery of the following:

http://cdn.sstatic.net/Sites/stackoverflow/mobile.css?v=4689877067de

priority - 3 Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 29.7KiB (64% reduction).

Compressing http://cdn.sstatic.net/Js/stub.en.js?v=f1b75fae2d6c could save 23.5KiB (65% reduction).
Compressing http://cdn.sstatic.net/Js/mobile.en.js?v=3199d1e28733 could save 6.2KiB (63% reduction).

priority - 1 Leverage browser caching

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://www.google-analytics.com/analytics.js (2 hours)

priority - 0 Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 2.9KiB (21% reduction).

Losslessly compressing http://cdn.sstatic.net/img/share-sprite-new.png?v=e1b8bd67bc12 could save 2.9KiB (21% reduction).

stackoverflow.com Mobile Resource Breakdown

Total Resources14
Number of Hosts7
Static Resources9
JavaScript Resources7
CSS Resources1

stackoverflow.com mobile page usability

Last tested: 2016-06-12


Mobile Usability Medium
80/100

stackoverflow.com Mobile Usability Test Quick Summary


priority - 23 Size tap targets appropriately

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 <a href="/questions/ask">Ask</a> is close to 1 other tap targets.

The tap target <a href="/questions/tagged/python" class="post-tag">python</a> and 318 others are close to other tap targets.

The tap target <a href="/questions/377…s?lastactivity">37 secs ago</a> and 95 others are close to other tap targets.

The tap target <a href="/questions/377…s?lastactivity">37 secs ago</a> and 179 others are close to other tap targets.

The tap target <a href="/questions/377…ata-in-node-js" class="question-hyperlink">using request data in node js</a> and 26 others are close to other tap targets.

The tap target <a href="/tour">tour</a> and 5 others are close to other tap targets.
The tap target <a href="https://play.g…xchange.marvin" class="android-mobile-ad">Download the S…ge Android app</a> is close to 1 other tap targets.

stackoverflow.com Mobile Resource Breakdown

Total Resources14
Number of Hosts7
Static Resources9
JavaScript Resources7
CSS Resources1

stackoverflow.com HTML validation

Errors

Attribute “itemprop” not allowed on element “meta” at this point.

Line: 15 Column: 5 - 164
"...."/> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon@2.png?v=73d79a89bded" /> ..." Line: 16 Column: 5 - 153
"...d" /> <meta name="twitter:title" property="og:title" itemprop="title name" content="Stack Overflow - Where Developers Learn, Share, &amp; Build Careers" /> <..." Line: 17 Column: 5 - 167
"...s" /> <meta name="twitter:description" property="og:description" itemprop="description" content="Stack Overflow | The World’s Largest Online Community for Developers" /> <..."

The “itemprop” attribute was specified, but the element is not a property of any item.

Line: 15 Column: 5 - 164
"...."/> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon@2.png?v=73d79a89bded" /> <..." Line: 16 Column: 5 - 153
"...d" /> <meta name="twitter:title" property="og:title" itemprop="title name" content="Stack Overflow - Where Developers Learn, Share, &amp; Build Careers" /> <..." Line: 17 Column: 5 - 167
"...s" /> <meta name="twitter:description" property="og:description" itemprop="description" content="Stack Overflow | The World’s Largest Online Community for Developers" /> <..."

Warnings

The “navigation” role is unnecessary for element “nav”.

Line: 67 Column: 17 - 87
"... <nav class="navigation" role="navigation" aria-label="site navigation"> ..."

The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.

Line: 334 Column: 100 - 201
"...ee to the <a href='https://stackexchange.com/legal/privacy-policy' name='privacy' target='_blank' class='-link'>privac..." Line: 334 Column: 225 - 324
"...y</a> and <a href='https://stackexchange.com/legal/terms-of-service' name='tos' target='_blank' class='-link'>terms ..."

The “contentinfo” role is unnecessary for element “footer”.

Line: 3501 Column: 5 - 70
"...div> <footer id="footer" class="s-footer js-footer" role="contentinfo"> ..."

This document appears to be written in Afrikaans. Consider adding “lang="af"” (or variant) to the “html” start tag.

Line: 2 Column: 16 - 6
"...TYPE html> <html> <hea..."

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stackoverflow.com Ping

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.


stackoverflow.com TRACEROUTE

Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.