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csdn.net Website Information

Daily Unique Visits: 56,439,490

Daily Page Views: 451,515,920

Income Per Day: $451,516

Estimated Value: $487,637,280

This website is located in China and is using following IP address 47.95.163.175. See the complete list of popular websites hosted in China.

csdn.net is registered under .NET top-level domain. Please check other sites in .NET zone.

Website csdn.net is using the following name servers:

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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 csdn.net position in Alexa rank database was 16 and the lowest rank position was 677. Current position of csdn.net in Alexa rank database is 27.

Desktop speed score of csdn.net (46/100) is better than the results of 15.79% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of csdn.net (99/100) is better than the results of 87.11% of other sites and means that the page is mobile-friendly.

Mobile speed score of csdn.net (61/100) is better than the results of 57.07% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

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csdn.net Alexa Rank

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csdn.net whois

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Domain Name: CSDN.NET
Registry Domain ID: 4252779_DOMAIN_NET-VRSN
Registrar WHOIS Server: grs-whois.hichina.com
Registrar URL: http://www.net.cn
Updated Date: 2020-05-13T09:06:10Z
Creation Date: 1999-03-11T05:00:00Z
Registry Expiry Date: 2022-03-11T04:00:00Z
Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.
Registrar IANA ID: 420
Registrar Abuse Contact Email: DomainAbuse@service.aliyun.com
Registrar Abuse Contact Phone: +86.95187
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: VIP3.ALIDNS.COM
Name Server: VIP4.ALIDNS.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2020-09-26T16:39:29Z

csdn.net server information

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csdn.net desktop page speed rank

Last tested: 2016-06-12


Desktop Speed Bad
46/100

csdn.net Desktop Speed Test Quick Summary


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priority - 24 Enable compression

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priority - 20 Leverage browser caching

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http://www.csdn.net/css/content.css (expiration not specified)
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priority - 18 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 18 blocking script resources and 4 blocking CSS resources. This causes a delay in rendering your page.

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priority - 9 Minify JavaScript

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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 34% of the final above-the-fold content could be rendered with the full HTML response.

priority - 0 Minify HTML

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priority - 0 Minify CSS

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csdn.net Desktop Resource Breakdown

Total Resources126
Number of Hosts18
Static Resources74
JavaScript Resources23
CSS Resources4

csdn.net mobile page speed rank

Last tested: 2019-07-24


Mobile Speed Bad
61/100

csdn.net Mobile Speed Test Quick Summary


priority - 48 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 7 blocking script resources and 4 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

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Optimize CSS Delivery of the following:

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priority - 8 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 68% 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 - 6 Enable compression

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priority - 4 Optimize images

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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:

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https://csdnimg.cn/public/common/toolbar/content_t…ss/m_toolbar-1.1.1.css (30 minutes)
https://csdnimg.cn/public/common/toolbar/js/m_toolbar-1.1.1.js (30 minutes)

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 1.4KiB (23% reduction).

Minifying https://csdnimg.cn/public/common/toolbar/js/m_toolbar-1.1.1.js could save 1.4KiB (23% reduction) after compression.

priority - 0 Minify HTML

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 360B (11% reduction).

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csdn.net Mobile Resource Breakdown

Total Resources26
Number of Hosts8
Static Resources14
JavaScript Resources11
CSS Resources4

csdn.net mobile page usability

Last tested: 2019-07-24


Mobile Usability Good
99/100

csdn.net Mobile Usability Test Quick Summary


priority - 0 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://blog.c…tails/96564875">MQTT物联网通信协议概论</a> is close to 1 other tap targets.

csdn.net Mobile Resource Breakdown

Total Resources26
Number of Hosts8
Static Resources14
JavaScript Resources11
CSS Resources4

csdn.net HTML validation

Errors

Attribute “ref” not allowed on element “link” at this point.

Line: 17 Column: 1 - 49
"...T ICON"> <link ref="canonical" href="http://www.csdn.net"> <scr..."

Element “link” is missing one or more of the following attributes: “itemprop”, “property”, “rel”.

Line: 17 Column: 1 - 49
"...T ICON"> <link ref="canonical" href="http://www.csdn.net"> <scr..."

Attribute “adsid” not allowed on element “div” at this point.

Line: 88 Column: 3 - 52
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Bad value “//images.csdn.net/20171201/VCG41533840620 (1).jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.

Line: 230 Column: 191 - 251
"...is,364);"><img src="//images.csdn.net/20171201/VCG41533840620 (1).jpg"></a><a..."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 230 Column: 191 - 251
"...is,364);"><img src="//images.csdn.net/20171201/VCG41533840620 (1).jpg"></a><a..." Line: 287 Column: 171 - 214
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"...is,342);"><img style="height:75px;width:75px;" src="//images.csdn.net/20171130/1.png"></a> ..." Line: 792 Column: 151 - 226
"...is,342);"><img style="height:75px;width:75px;" src="//images.csdn.net/20171124/0.jpg"></a> ..." Line: 796 Column: 149 - 226
"...is,342);"><img style="height:75px;width:75px;" src="//images.csdn.net/20171123/101.jpg"></a> ..." Line: 800 Column: 149 - 224
"...is,342);"><img style="height:75px;width:75px;" src="//images.csdn.net/20171117/3.jpg"></a> ..." Line: 825 Column: 171 - 215
"...is,340);"><img src="//images.csdn.net/20171103/11.jpg"></a> ..."

Duplicate attribute “onclick”.

Line: 301 Column: - 192
"...,333);" onclick="LogClickCount..." Line: 305 Column: - 182
"...,333);" onclick="LogClickCount..." Line: 309 Column: - 182
"...,333);" onclick="LogClickCount..." Line: 313 Column: - 181
"...,333);" onclick="LogClickCount..." Line: 317 Column: - 197
"...,333);" onclick="LogClickCount..."

Bad value “//images.csdn.net/20171115/fcae6510-c5cb-11e7-9154-91d1d4c7e259 (1)01.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.

Line: 316 Column: 33 - 175
"... <img style="-webkit-user-select: none" src="//images.csdn.net/20171115/fcae6510-c5cb-11e7-9154-91d1d4c7e259 (1)01.jpg" data-pinit="registered"> ..."

No space between attributes.

Line: 369 Column: - 195
"... class="image"src="//images.c..." Line: 376 Column: - 217
"... class="image"src="//images.c..." Line: 413 Column: - 194
"... class="image"src="//images.c..." Line: 432 Column: - 192
"... class="image"src="//images.c..." Line: 469 Column: - 205
"... class="image"src="//images.c..." Line: 495 Column: - 201
"... class="image"src="//images.c..." Line: 514 Column: - 198
"... class="image"src="//images.c..."

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

Line: 396 Column: 20 - 99
"... <ins data-revive-zoneid="137" data-revive-id="8c38e720de1c90a6f6ff52f3f89c4d57"></ins>..." Line: 399 Column: 20 - 99
"... <ins data-revive-zoneid="138" data-revive-id="8c38e720de1c90a6f6ff52f3f89c4d57"></ins>..." Line: 458 Column: 20 - 99
"... <ins data-revive-zoneid="139" data-revive-id="8c38e720de1c90a6f6ff52f3f89c4d57"></ins>..." Line: 461 Column: 20 - 99
"... <ins data-revive-zoneid="140" data-revive-id="8c38e720de1c90a6f6ff52f3f89c4d57"></ins>..."

Element “div” is missing a required instance of child element “dd”.

Line: 397 Column: 19 - 24
"... </div> ..." Line: 400 Column: 19 - 24
"... </div> ..." Line: 459 Column: 19 - 24
"... </div> ..." Line: 462 Column: 19 - 24
"... </div> ..."

Element “div” is missing a required instance of child element “dt”.

Line: 397 Column: 19 - 24
"... </div> ..." Line: 400 Column: 19 - 24
"... </div> ..." Line: 459 Column: 19 - 24
"... </div> ..." Line: 462 Column: 19 - 24
"... </div> ..."

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

Line: 552 Column: 11 - 30
"... <div align="center"><a hre..."

Element “dl” is missing a required child element.

Line: 594 Column: 9 - 12
"...> <dd> ..." Line: 657 Column: 6 - 49
"...<dl> <dd class="tracking-ad" data-mod="popu_125"> <..." Line: 760 Column: 9 - 28
"...> <dd adsid="home10a"> ..." Line: 1041 Column: 4 - 24
"... <dl> <dd class="backblue"><a hre..."

Element “dl” is missing a required instance of child element “dd”.

Line: 634 Column: 7 - 11
"...dt> </dl> ..." Line: 803 Column: 15 - 19
"... </dl> <..."

Attribute “adsid” not allowed on element “li” at this point.

Line: 636 Column: 8 - 26
"..."> <li adsid="home09"> ..."

Stray end tag “a”.

Line: 685 Column: 17 - 20
"... </a> ..." Line: 698 Column: 17 - 20
"... </a> ..."

Attribute “adsid” not allowed on element “dd” at this point.

Line: 760 Column: 9 - 28
"...> <dd adsid="home10a"> ..." Line: 763 Column: 9 - 28
"...> <dd adsid="home10b"> ..." Line: 766 Column: 9 - 28
"...> <dd adsid="home10c"> ..." Line: 769 Column: 9 - 28
"...> <dd adsid="home10d"> ..."

Stray end tag “div”.

Line: 885 Column: 1 - 6
"...ntent--> </div> <div ..."

Stray start tag “script”.

Line: 1071 Column: 1 - 97
"...> </body> <script src="//csdnimg.cn/public/common/libs/jquery/jquery-1.11.1.min.js" type="text/javascript"></scri..."

Attribute “btnid” not allowed on element “script” at this point.

Line: 1078 Column: 1 - 184
"...script> <script id="noticeScript" type="text/javascript" charset="utf-8" btnId="header_notice_num" wrapId="note1" count="5" subCount="5" src="//csdnimg.cn/rabbit/notev2/js/notify.js?12601115"></scri..."

Attribute “wrapid” not allowed on element “script” at this point.

Line: 1078 Column: 1 - 184
"...script> <script id="noticeScript" type="text/javascript" charset="utf-8" btnId="header_notice_num" wrapId="note1" count="5" subCount="5" src="//csdnimg.cn/rabbit/notev2/js/notify.js?12601115"></scri..."

Attribute “count” not allowed on element “script” at this point.

Line: 1078 Column: 1 - 184
"...script> <script id="noticeScript" type="text/javascript" charset="utf-8" btnId="header_notice_num" wrapId="note1" count="5" subCount="5" src="//csdnimg.cn/rabbit/notev2/js/notify.js?12601115"></scri..."

Attribute “subcount” not allowed on element “script” at this point.

Line: 1078 Column: 1 - 184
"...script> <script id="noticeScript" type="text/javascript" charset="utf-8" btnId="header_notice_num" wrapId="note1" count="5" subCount="5" src="//csdnimg.cn/rabbit/notev2/js/notify.js?12601115"></scri..."

Warnings

The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.

Line: 850 Column: - 50
"...人通过的超5星微软比赛题目-------解题思路&优秀代码分..."

The “language” attribute on the “script” element is obsolete. You can safely omit it.

Line: 1075 Column: 1 - 116
".../script> <script language="javascript" type="text/javascript" src="//csdnimg.cn/public/common/baiduspider-cpro/async_new.js"></scri..."

This document appears to be written in Simplified Chinese. Consider adding “lang="zh-hans"” (or variant) to the “html” start tag.

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

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csdn.net 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.


csdn.net 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.