Class.cn 在线学习网络课程 | 好课网 - 中国教育在线
好课网是中国教育在线的在线学习平台，该平台面向学习者提供涵盖基础教育、高等教育以及行业培训等海量优质网络课程，汇聚各行业精英，你可以自由选择你所需的或者感兴趣的网络课程在线学习，好课网邀你一起来学习和分享！
Server IP address resolved: Yes
Http response code: 200
Response time: 0.92 sec.
Last Checked: 04/27/2024
Class.cn traffic volume is 128 unique daily visitors and their 1,027 pageviews. The web value rate of class.cn is 9,373 USD. Each visitor makes around 8.56 page views on average.
By Alexa's traffic estimates class.cn placed at 41,180 position over the world.
Class.cn server is located in China, therefore, we cannot identify the countries where the traffic is originated and if the distance can potentially affect the page load time. See the list of other web pages hosted by ERX-CERNET-BKB China Education and Research Network Center, CN.
Class.cn registered under .CN top-level domain. Check other websites in .CN zone.
The last verification results, performed on (April 27, 2024) class.cn show that class.cn has an invalid SSL certificate. Click “Refresh” button for SSL Information at the Safety Information section.
In accordance with Google Safe Browsing, Google Safe Search and Symantec class.cn is pretty a safe domain.
Relying Google MobileFriendly test class.cn is well optimized for mobile and tablet devices, however web page loading speed may be improved.
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 ConnectSafe evaluates class.cn for any unsafe and insecure content. The results are critical for families with young children.
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.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.
Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.
McAfee assesses class.cn 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 class.cn for mature or inappropriate content, only security checks are evaluated.
The WOT calculates reputation of the class.cn. This reputation system receives ratings from users and information from third-party sources, assesses the class.cn for safety features and confirms, whether class.cn is suitable for children.
| WARNING! | Certificate download error. Previous scan results are shown below. |
| Domain | Unknown |
| Issuer Organization | Unknown |
| Issuer | Unknown |
| Algorithm | Unknown |
| Valid form | Unknown |
| Expiration | Unknown |
| Signed | No information |
| Additional Domains |
ASN ID: 4538
ASN Title: ERX-CERNET-BKB China Education and Research Network Center, CN
Last Update: 10/14/2023
% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html
% Information related to 'AS4538'
% Abuse contact for 'AS4538' is 'abuse@net.edu.cn'
aut-num: AS4538
as-name: ERX-CERNET-BKB
descr: China Education and Research Network Center
descr: Tsinghua University
descr: Beijing 100084
country: CN
admin-c: JW410-AP
tech-c: JW410-AP
remarks: This aut-num object created as part of
remarks: the ER-Transfer from ARIN
mnt-by: MAINT-CERNET-AP
mnt-irt: IRT-CERNET-AP
mnt-routes: MAINT-CERNET-AP
last-modified: 2016-10-17T00:30:08Z
source: APNIC
irt: IRT-CERNET-AP
address: Network Research Center,
address: Main Bldg, Tsinghua Univ
address: Beijing 100084, China
phone: +86-10-62784301
fax-no: +86-10-62785933
e-mail: abuse@net.edu.cn
abuse-mailbox: abuse@net.edu.cn
admin-c: CER-AP
tech-c: CER-AP
auth: # Filtered
remarks: timezone GMT+8
remarks: http://www.ccert.edu.cn
mnt-by: MAINT-CERNET-AP
last-modified: 2010-11-26T03:14:01Z
source: APNIC
person: Jianping Wu
address: China Education and Research Network Center
address: Tsinghua University
address: Beijing 100084
country: CN
phone: +86-10-2595931
e-mail: jianping@CERNET.EDU.CN
nic-hdl: JW410-AP
remarks: This person object created as part of the ER-Transfer from ARIN
mnt-by: MAINT-CN-CERNET
last-modified: 2008-09-04T07:29:20Z
source: APNIC
% This query was served by the APNIC Whois Service version 1.88.15-46 (WHOIS-US3)
Domain Name: class.cn
ROID: 20030312s10001s00045584-cn
Domain Status: ok
Registrant: 北京好课优学科技有限公司
Registrant Contact Email: 2386373@qq.com
Sponsoring Registrar: 赛尔网络有限公司
Name Server: dns1.resource.edu.cn
Name Server: dns2.resource.edu.cn
Registration Time: 2003-03-17 12:20:05
Expiration Time: 2023-03-17 12:48:36
DNSSEC: unsigned
| Host | A Record | TTL |
|---|---|---|
| class.cn | 202.205.109.70 | 300 |
| Host | MX Record | Priority | TTL |
|---|---|---|---|
| class.cn | mail.class.cn | 10 | 600 |
| Host | NS Record | TTL |
|---|---|---|
| class.cn | dns1.resource.edu.cn | 600 |
| class.cn | dns2.resource.edu.cn | 600 |
| Host | TXT Record | TTL |
|---|---|---|
| class.cn | v=spf1,ip4:202.205.109.0/24,ip4:202.205.4.0/25,-all | 3600 |
ns.class.cn
TTL: 3600
Email address: postmaster.class.cn
Serial: 2019080807
Refresh: 28800
Retry: 7200
Expire: 604800
Minimum: 3600
Last tested: 01/01/2019
| Total Resources | 90 |
| Number of Hosts | 13 |
| Static Resources | 78 |
| JavaScript Resources | 15 |
| CSS Resources | 4 |
Last tested: 01/01/2019
| Total Resources | 27 |
| Number of Hosts | 3 |
| Static Resources | 25 |
| JavaScript Resources | 3 |
| CSS Resources | 4 |
www.class.net
www.class.org
www.class.info
www.class.biz
www.class.us
www.class.mobi
www.lass.cn
www.class.cn
www.xlass.cn
www.cxlass.cn
www.xclass.cn
www.dlass.cn
www.cdlass.cn
www.dclass.cn
www.flass.cn
www.cflass.cn
www.fclass.cn
www.vlass.cn
www.cvlass.cn
www.vclass.cn
www.cass.cn
www.cpass.cn
www.clpass.cn
www.cplass.cn
www.coass.cn
www.cloass.cn
www.colass.cn
www.ckass.cn
www.clkass.cn
www.cklass.cn
www.clss.cn
www.clqss.cn
www.claqss.cn
www.clqass.cn
www.clwss.cn
www.clawss.cn
www.clwass.cn
www.clsss.cn
www.classs.cn
www.clsass.cn
www.clzss.cn
www.clazss.cn
www.clzass.cn
www.clas.cn
www.claws.cn
www.clasws.cn
www.claes.cn
www.clases.cn
www.claess.cn
www.clads.cn
www.clasds.cn
www.cladss.cn
www.clazs.cn
www.claszs.cn
www.claxs.cn
www.clasxs.cn
www.claxss.cn
www.claas.cn
www.clasas.cn
www.claass.cn
www.clasw.cn
www.classw.cn
www.clase.cn
www.classe.cn
www.clasd.cn
www.classd.cn
www.clasz.cn
www.classz.cn
www.clasx.cn
www.classx.cn
www.clasa.cn
www.classa.cn