w3cschool.cn Website Information
Daily Unique Visits: 37,918
Daily Page Views: 227,508
Income Per Day: $455
Estimated Value: $327,600
This website is located in China and is using following IP address 120.79.88.157. See the complete list of popular websites hosted in China.
w3cschool.cn is registered under .CN top-level domain. Please check other sites in .CN zone.
Website w3cschool.cn is using the following name servers:
- ns4.dnsv2.com
- ns3.dnsv2.com
and is probably hosted by CNNIC-ALIBABA-CN-NET-AP Hangzhou Alibaba Advertising Co.,Ltd., CN. See the full list of other websites hosted by CNNIC-ALIBABA-CN-NET-AP Hangzhou Alibaba Advertising Co.,Ltd., CN.
The highest website w3cschool.cn position in Alexa rank database was 36703 and the lowest rank position was 80876. Current position of w3cschool.cn in Alexa rank database is 37824.
Desktop speed score of w3cschool.cn (93/100) is better than the results of 91.83% of other sites and shows that the page is performing great on desktop computers.
Mobile usability score of w3cschool.cn (100/100) is better than the results of 100% of other sites and means that the page is mobile-friendly.
Mobile speed score of w3cschool.cn (56/100) is better than the results of 45.93% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.
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w3cschool.cn 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.
w3cschool.cn 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: w3cschool.cn
ROID: 20090804s10001s78916204-cn
Domain Status: clientTransferProhibited
Registrant: 厦门亿动网络科技有限公司
Registrant Contact Email: faren@eeedong.com
Sponsoring Registrar: 厦门易名科技股份有限公司
Name Server: ns3.dnsv2.com
Name Server: ns4.dnsv2.com
Registration Time: 2009-08-04 09:00:40
Expiration Time: 2026-08-04 09:00:40
DNSSEC: unsigned
ROID: 20090804s10001s78916204-cn
Domain Status: clientTransferProhibited
Registrant: 厦门亿动网络科技有限公司
Registrant Contact Email: faren@eeedong.com
Sponsoring Registrar: 厦门易名科技股份有限公司
Name Server: ns3.dnsv2.com
Name Server: ns4.dnsv2.com
Registration Time: 2009-08-04 09:00:40
Expiration Time: 2026-08-04 09:00:40
DNSSEC: unsigned
w3cschool.cn server information
Servers Location
w3cschool.cn desktop page speed rank
Last tested: 2015-09-29
Desktop Speed
Good
93/100
w3cschool.cn Desktop Speed Test Quick Summary
priority - 4Leverage 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:
http://w3cschool.cn/c3.css (expiration not specified)
http://w3cschool.cn/site_head_index.gif (expiration not specified)
http://w3cschool.cn/site_holder.gif (expiration not specified)
http://w3cschool.cn/site_nav.gif (expiration not specified)
http://w3cschool.cn/site_photoexa.jpg (expiration not specified)
http://w3cschool.cn/site_photoqe.jpg (expiration not specified)
http://w3cschool.cn/site_photoref.jpg (expiration not specified)
http://w3cschool.cn/site_wrapper.gif (expiration not specified)
http://w3cschool.cn/site_head_index.gif (expiration not specified)
http://w3cschool.cn/site_holder.gif (expiration not specified)
http://w3cschool.cn/site_nav.gif (expiration not specified)
http://w3cschool.cn/site_photoexa.jpg (expiration not specified)
http://w3cschool.cn/site_photoqe.jpg (expiration not specified)
http://w3cschool.cn/site_photoref.jpg (expiration not specified)
http://w3cschool.cn/site_wrapper.gif (expiration not specified)
priority - 2Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 1 blocking CSS resources. This causes a delay in rendering your page.
Optimize CSS Delivery of the following:
http://w3cschool.cn/c3.css
priority - 0Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 1.9KiB (16% reduction).
Losslessly compressing http://w3cschool.cn/site_nav.gif could save 1.1KiB (18% reduction).
Losslessly compressing http://w3cschool.cn/site_head_index.gif could save 861B (14% reduction).
Losslessly compressing http://w3cschool.cn/site_head_index.gif could save 861B (14% reduction).
w3cschool.cn Desktop Resource Breakdown
| Total Resources | 9 |
| Number of Hosts | 1 |
| Static Resources | 8 |
| CSS Resources | 1 |
w3cschool.cn mobile page speed rank
Last tested: 2019-07-04
Mobile Speed
Bad
56/100
w3cschool.cn Mobile Speed Test Quick Summary
priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 4 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.
Remove render-blocking JavaScript:
https://g.alicdn.com/sj/lib/zepto/zepto.min.js
https://g.alicdn.com/msui/sm/0.5.9/js/sm.min.js
https://g.alicdn.com/msui/sm/0.6.1/js/sm-extend.min.js
https://7nsts.w3cschool.cn/js/m.js
https://g.alicdn.com/msui/sm/0.5.9/js/sm.min.js
https://g.alicdn.com/msui/sm/0.6.1/js/sm-extend.min.js
https://7nsts.w3cschool.cn/js/m.js
Optimize CSS Delivery of the following:
https://g.alicdn.com/msui/sm/0.6.1/css/sm.min.css
https://g.alicdn.com/msui/sm/0.6.1/css/sm-extend.min.css
https://www.w3cschool.cn/statics/css/m.css
https://g.alicdn.com/msui/sm/0.6.1/css/sm-extend.min.css
https://www.w3cschool.cn/statics/css/m.css
priority - 34Avoid landing page redirects
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://w3cschool.cn/
https://www.w3cschool.cn/
https://m.w3cschool.cn/
https://www.w3cschool.cn/
https://m.w3cschool.cn/
priority - 8Prioritize 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 42% of the final above-the-fold content could be rendered with the full HTML response.
Click to see the screenshot with only the HTML response:
priority - 1Leverage 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.w3cschool.cn/statics/css/m.css (2 hours)
https://7nsts.w3cschool.cn/js/m.js (24 hours)
https://7nsts.w3cschool.cn/js/m.js (24 hours)
priority - 0Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 1.5KiB (11% reduction).
Compressing https://7n.w3cschool.cn/attachments/collection/cov…35283.png?t=1538035286 could save 1.5KiB (11% reduction).
priority - 0Minify 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 906B (26% reduction).
Minifying https://7nsts.w3cschool.cn/js/m.js could save 906B (26% reduction) after compression.
priority - 0Minify CSS
Compacting CSS code can save many bytes of data and speed up download and parse times.
Minify CSS for the following resources to reduce their size by 395B (15% reduction).
Minifying https://www.w3cschool.cn/statics/css/m.css could save 395B (15% reduction) after compression.
w3cschool.cn Mobile Resource Breakdown
| Total Resources | 85 |
| Number of Hosts | 7 |
| Static Resources | 80 |
| JavaScript Resources | 5 |
| CSS Resources | 3 |
w3cschool.cn mobile page usability
Last tested: 2019-07-04
Mobile Usability
Good
100/100
w3cschool.cn HTML validation
Errors
Bad value “//www.w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Line: 2 Column: 16 - 48
"...TYPE html> <html lang="en" xmlns="//www.w3.org/1999/xhtml"> <head..."
"...TYPE html> <html lang="en" xmlns="//www.w3.org/1999/xhtml"> <head..."
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Line: 6 Column: 1 - 64
"...始</title> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <meta..."
"...始</title> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <meta..."
Attribute “loaddo” not allowed on element “a” at this point.
Line: 37 Column: 1 - 174
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
Bad value “quick-add” for attribute “rel” on element “a”: The string “quick-add” is not a registered keyword.
Line: 37 Column: 1 - 174
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
Attribute “mask” not allowed on element “a” at this point.
Line: 37 Column: 1 - 174
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
Attribute “height” not allowed on element “a” at this point.
Line: 37 Column: 1 - 174
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
Attribute “width” not allowed on element “a” at this point.
Line: 37 Column: 1 - 174
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
"...>+ 发布</a> <a style="display: none;" id="loadNav" href="/my/knowledge/addkn" target="dialog" loaddo="addkn" rel="quick-add" mask="true" height="430" width="720" class="btn btn-default"><i cla..."
Attribute “position” not allowed on element “li” at this point.
Line: 90 Column: 1 - 41
"...rt-list"> <li class="menu-item-focus" position="0"> <div ..." Line: 100 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="49"> <div ..." Line: 111 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="51"> <div ..." Line: 122 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="54"> <div ..." Line: 133 Column: 1 - 43
"...iv> </li> <li class="menu-item-focus" position="112"> <div ..." Line: 143 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="52"> <div ..."
"...rt-list"> <li class="menu-item-focus" position="0"> <div ..." Line: 100 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="49"> <div ..." Line: 111 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="51"> <div ..." Line: 122 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="54"> <div ..." Line: 133 Column: 1 - 43
"...iv> </li> <li class="menu-item-focus" position="112"> <div ..." Line: 143 Column: 1 - 42
"...iv> </li> <li class="menu-item-focus" position="52"> <div ..."
Attribute “position” not allowed on element “div” at this point.
Line: 158 Column: 1 - 56
"...content"> <div class="menu-item-box menu-item-focus" position="0"> <div ..." Line: 233 Column: 1 - 57
"...> </div> <div class="menu-item-box menu-item-focus" position="49"> <div ..." Line: 310 Column: 1 - 57
"...l> </div> <div class="menu-item-box menu-item-focus" position="51"> <div ..." Line: 346 Column: 1 - 57
"...l> </div> <div class="menu-item-box menu-item-focus" position="54"> <div ..." Line: 379 Column: 1 - 58
"...l> </div> <div class="menu-item-box menu-item-focus" position="112"> <div ..." Line: 399 Column: 1 - 57
"...l> </div> <div class="menu-item-box menu-item-focus" position="52"> <div ..."
"...content"> <div class="menu-item-box menu-item-focus" position="0"> <div ..." Line: 233 Column: 1 - 57
"...> </div> <div class="menu-item-box menu-item-focus" position="49"> <div ..." Line: 310 Column: 1 - 57
"...l> </div> <div class="menu-item-box menu-item-focus" position="51"> <div ..." Line: 346 Column: 1 - 57
"...l> </div> <div class="menu-item-box menu-item-focus" position="54"> <div ..." Line: 379 Column: 1 - 58
"...l> </div> <div class="menu-item-box menu-item-focus" position="112"> <div ..." Line: 399 Column: 1 - 57
"...l> </div> <div class="menu-item-box menu-item-focus" position="52"> <div ..."
Attribute “bgcolor” not allowed on element “div” at this point.
Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 444 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#f0857c"> <div ..." Line: 451 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d33432"> <div ..." Line: 458 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d3d3d3"> <div ..." Line: 465 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#dfdfdf"> <div ..."
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 444 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#f0857c"> <div ..." Line: 451 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d33432"> <div ..." Line: 458 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d3d3d3"> <div ..." Line: 465 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#dfdfdf"> <div ..."
Attribute “stat” not allowed on element “a” at this point.
Line: 439 Column: 1 - 43
"...unt-box"> <a stat="sslink-1" href="" target="_blank"> <div ..." Line: 446 Column: 1 - 73
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/minicourse/" target="_blank"> <div ..." Line: 453 Column: 1 - 65
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/vip" target="_blank"> <div ..." Line: 460 Column: 1 - 70
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/download" target="_blank"> <div ..." Line: 467 Column: 1 - 70
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/codecamp" target="_blank"> <div ..." Line: 474 Column: 1 - 52
"...: none;"> <a class="prev" href="javascript:;" stat="prev1001"><img s..." Line: 475 Column: 1 - 52
"...一张"/></a> <a class="next" href="javascript:;" stat="next1002"><img s..." Line: 478 Column: 1 - 51
"...s="item"> <a class="cur" stat="item1001" href="javascript:;"></a><a..." Line: 478 Column: 56 - 94
"...pt:;"></a><a href="javascript:;" stat="item1002"></a><a..." Line: 478 Column: 99 - 137
"...1002"></a><a href="javascript:;" stat="item1003"></a><a..." Line: 478 Column: 142 - 180
"...1003"></a><a href="javascript:;" stat="item1004"></a><a..." Line: 478 Column: 185 - 223
"...1004"></a><a href="javascript:;" stat="item1005"></a> <..."
"...unt-box"> <a stat="sslink-1" href="" target="_blank"> <div ..." Line: 446 Column: 1 - 73
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/minicourse/" target="_blank"> <div ..." Line: 453 Column: 1 - 65
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/vip" target="_blank"> <div ..." Line: 460 Column: 1 - 70
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/download" target="_blank"> <div ..." Line: 467 Column: 1 - 70
"...unt-box"> <a stat="sslink-1" href="//www.w3cschool.cn/codecamp" target="_blank"> <div ..." Line: 474 Column: 1 - 52
"...: none;"> <a class="prev" href="javascript:;" stat="prev1001"><img s..." Line: 475 Column: 1 - 52
"...一张"/></a> <a class="next" href="javascript:;" stat="next1002"><img s..." Line: 478 Column: 1 - 51
"...s="item"> <a class="cur" stat="item1001" href="javascript:;"></a><a..." Line: 478 Column: 56 - 94
"...pt:;"></a><a href="javascript:;" stat="item1002"></a><a..." Line: 478 Column: 99 - 137
"...1002"></a><a href="javascript:;" stat="item1003"></a><a..." Line: 478 Column: 142 - 180
"...1003"></a><a href="javascript:;" stat="item1004"></a><a..." Line: 478 Column: 185 - 223
"...1004"></a><a href="javascript:;" stat="item1005"></a> <..."
Duplicate ID “bgstyleb”.
Line: 444 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#f0857c"> <div ..." Line: 451 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d33432"> <div ..." Line: 458 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d3d3d3"> <div ..." Line: 465 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#dfdfdf"> <div ..."
"... <div class="slide" id="bgstyleb" bgcolor="#f0857c"> <div ..." Line: 451 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d33432"> <div ..." Line: 458 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#d3d3d3"> <div ..." Line: 465 Column: 1 - 51
"... <div class="slide" id="bgstyleb" bgcolor="#dfdfdf"> <div ..."
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Line: 518 Column: 1 - 95
"...style=""> <img style="width: 180px;height: 180px;" src="/qrapi?text=//www.youj.com/auth?platform=weixin"> <div ..." Line: 1638 Column: 1 - 94
"...: left;"> <img class="register-cover" src="//img.w3cschool.cn/attachments/avatar/avatar_c383542045.jpg"> </div..."
"...style=""> <img style="width: 180px;height: 180px;" src="/qrapi?text=//www.youj.com/auth?platform=weixin"> <div ..." Line: 1638 Column: 1 - 94
"...: left;"> <img class="register-cover" src="//img.w3cschool.cn/attachments/avatar/avatar_c383542045.jpg"> </div..."
Attribute “ref” not allowed on element “a” at this point.
Line: 1687 Column: 1 - 138
"...>友情链接</a> <a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=69bf2226eb0fbd411c740b015055bab665fcef4721dbe974882223b476e2962e" ref="nofollow">官方QQ群：..." Line: 1688 Column: 1 - 108
"...19487</a> <a target="_blank" href="//wpa.qq.com/msgrd?v=3&uin=3532917531&site=qq&menu=yes" ref="nofollow">商务合作QQ..."
"...>友情链接</a> <a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=69bf2226eb0fbd411c740b015055bab665fcef4721dbe974882223b476e2962e" ref="nofollow">官方QQ群：..." Line: 1688 Column: 1 - 108
"...19487</a> <a target="_blank" href="//wpa.qq.com/msgrd?v=3&uin=3532917531&site=qq&menu=yes" ref="nofollow">商务合作QQ..."
Attribute “type” not allowed on element “div” at this point.
Line: 1717 Column: 1 - 81
"...ck-box" > <div id="feedbackRadio" type="radio" name="feedbackType" data-value="0" style=""> 意见反馈：..."
"...ck-box" > <div id="feedbackRadio" type="radio" name="feedbackType" data-value="0" style=""> 意见反馈：..."
Attribute “name” not allowed on element “div” at this point.
Line: 1717 Column: 1 - 81
"...ck-box" > <div id="feedbackRadio" type="radio" name="feedbackType" data-value="0" style=""> 意见反馈：..."
"...ck-box" > <div id="feedbackRadio" type="radio" name="feedbackType" data-value="0" style=""> 意见反馈：..."
Warnings
Attribute “xmlns” is not serializable as XML 1.0.
Line: 2 Column: 16 - 48
"...TYPE html> <html lang="en" xmlns="//www.w3.org/1999/xhtml"> <head..."
"...TYPE html> <html lang="en" xmlns="//www.w3.org/1999/xhtml"> <head..."
The first occurrence of ID “bgstyleb” was here.
Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..."
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..." Line: 437 Column: 1 - 51
"...tn-box" > <div class="slide" id="bgstyleb" bgcolor="#e5e5e5"> <div ..."
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w3cschool.cn 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.
w3cschool.cn 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.