STACKOVERFLOW.COM Stack Overflow - Where Developers Learn, Share, & Build Careers

stackoverflow.com Website Information

Daily Unique Visits: 32,422,686

Daily Page Views: 259,381,488

Income Per Day: $259,381

Estimated Value: $280,131,480

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 47.

Desktop speed score of stackoverflow.com (84/100) is better than the results of 81.3% of other sites and shows that the page is performing great on desktop computers.

Mobile usability score of stackoverflow.com (92/100) is better than the results of 48.11% of other sites and means that the page is mobile-friendly.

Mobile speed score of stackoverflow.com (71/100) is better than the results of 80.02% 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: 2019-01-11T17:52:14Z
Creation Date: 2003-12-26T19:18:07Z
Registry Expiry Date: 2020-02-02T11:59:59Z
Registrar: Name.com, Inc.
Registrar IANA ID: 625
Registrar Abuse Contact Email: abuse@name.com
Registrar Abuse Contact Phone: 7202492374
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS-1033.AWSDNS-01.ORG
Name Server: NS-358.AWSDNS-44.COM
Name Server: NS-CLOUD-E1.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-E2.GOOGLEDOMAINS.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2019-06-15T19:57:57Z

stackoverflow.com server information

Servers Location

stackoverflow.com desktop page speed rank

Last tested: 2019-06-15


Desktop Speed Medium
84/100

stackoverflow.com Desktop Speed Test Quick Summary


priority - 12 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 1 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

https://cdn.sstatic.net/Js/stub.en.js?v=036380eacc61

Optimize CSS Delivery of the following:

https://cdn.sstatic.net/Shared/stacks.css?v=e6f9c0ce1d23
https://cdn.sstatic.net/Sites/stackoverflow/primary.css?v=ff60e321b9c8

priority - 3 Optimize images

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

Optimize the following images to reduce their size by 32.1KiB (30% reduction).

Compressing https://s0.2mdn.net/4806710/03202019-103801239-PayPal_-_teal_300x250.jpg could save 15.3KiB (47% reduction).
Compressing https://cdn.sstatic.net/img/favicons-sprite16.png?v=d4eea8c36ff2 could save 13.9KiB (20% reduction).
Compressing https://i.stack.imgur.com/EdUwb.png could save 2.6KiB (72% reduction).
Compressing https://i.stack.imgur.com/bk9VA.png could save 145B (28% reduction).
Compressing https://i.stack.imgur.com/iXVPe.png could save 109B (13% reduction).
Compressing https://i.stack.imgur.com/bpLjl.png could save 106B (16% reduction).

priority - 2 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.googletagservices.com/tag/js/gpt.js (15 minutes)
https://www.googletagservices.com/activeview/js/cu…osd.js?cb=%2Fr20100101 (50 minutes)
https://www.googletagservices.com/activeview/js/cu…ner.js?cache=r20110914 (50 minutes)
https://www.google-analytics.com/analytics.js (2 hours)

stackoverflow.com Desktop Resource Breakdown

Total Resources46
Number of Hosts18
Static Resources29
JavaScript Resources19
CSS Resources3

stackoverflow.com mobile page speed rank

Last tested: 2019-06-15


Mobile Speed Medium
71/100

stackoverflow.com Mobile Speed Test Quick Summary


priority - 40 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:

https://cdn.sstatic.net/Js/stub.en.js?v=036380eacc61
https://cdn.sstatic.net/Js/mobile.en.js?v=32a7cb3d19b9

Optimize CSS Delivery of the following:

https://cdn.sstatic.net/Shared/stacks.css?v=e6f9c0ce1d23
https://cdn.sstatic.net/Sites/stackoverflow/mobile.css?v=aa469b5e83cf

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)

stackoverflow.com Mobile Resource Breakdown

Total Resources18
Number of Hosts9
Static Resources11
JavaScript Resources9
CSS Resources2

stackoverflow.com mobile page usability

Last tested: 2019-06-15


Mobile Usability Good
92/100

stackoverflow.com Mobile Usability Test Quick Summary


priority - 7 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="https://stacko…/cookie-policy" class="s-link s-link_…rline fc-white">Cookie Policy</a> and 2 others are close to other tap targets.

The tap target <a class="grid--cell fc-…s-notice-close"></a> is close to 1 other tap targets.

The tap target <a class="grid--cell fc-…s-notice-close"></a> is close to 1 other tap targets.

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

The tap target <a href="/questions/566…t?lastactivity" class="-time">1 min ago</a> and 191 others are close to other tap targets.

The tap target <a href="/users/5842844/jbarat" class="author">jbarat</a> and 81 others are close to other tap targets.

The tap target <a href="/questions/566…ord-encryption">Spring: password encryption</a> and 75 others are close to other tap targets.

The tap target <a href="/questions/tag…ooth-lowenergy" class="post-tag">bluetooth-lowenergy</a> and 19 others are close to other tap targets.

stackoverflow.com Mobile Resource Breakdown

Total Resources18
Number of Hosts9
Static Resources11
JavaScript Resources9
CSS Resources2

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.