21tb.com 时代光华官网

时代光华是基于网络的组织学习方案服务商,目前以elearning网络学习服务为主业,业务涵盖内容、平台、课件软件定制、移动学习、多媒体产品、教材、公开课、内训、组织学习咨询服务等领域。

NatureNature

Online Status
Online

Server IP address resolved: Yes
Http response code: 200
Response time: 3.16 sec.
Last Checked: 11/30/2022

21tb.com traffic volume is 849,773 unique daily visitors and their 6,798,181 pageviews. The web value rate of 21tb.com is 7,341,527 USD. Each visitor makes around 8.56 page views on average.

By Alexa's traffic estimates 21tb.com placed at 821 position over the world.

21tb.com 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 CHINA169-BJ China Unicom Beijing Province Network, CN.

21tb.com registered under .COM top-level domain. Check other websites in .COM zone.

The last verification results, performed on (November 14, 2019) 21tb.com show that 21tb.com has an expired wildcard SSL certificate issued by DigiCert Inc (expired on June 08, 2020). Click “Refresh” button for SSL Information at the Safety Information section. Check the list of websites using SSL certificates issued by DigiCert Inc.

In accordance with Google Safe Browsing and Symantec 21tb.com is pretty a safe domain.

Relying Google MobileFriendly test 21tb.com is well optimized for mobile and tablet devices, however web page loading speed may be improved.

NatureNature

Global Rank
0
Average Load Time
0.00sec
Links In Count
0
Website Value
$6.9 M
NatureNature

Overview
Last Updated: 11/30/2022
Unknown status.
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 Connect Safe
Last Updated: 03/20/2022
21tb.com is safe.
Norton ConnectSafe evaluates 21tb.com for any unsafe and insecure content. The results are critical for families with young children.
Google Safe Search
Last Updated: 11/30/2022
Unknown status.
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.
Google Safe Browsing
Last Updated: 01/09/2019
21tb.com is safe.
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.
Site Advisor
Last Updated: 02/22/2021
21tb.com is safe.
McAfee assesses 21tb.com 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 21tb.com for mature or inappropriate content, only security checks are evaluated.
Web of Trust
Last Updated: 11/30/2022
21tb.com child safety is unknown.
The WOT calculates reputation of the 21tb.com. This reputation system receives ratings from users and information from third-party sources, assesses the 21tb.com for safety features and confirms, whether 21tb.com is suitable for children.

SSL Information
Domain*.21tb.com
Issuer OrganizationDigiCert Inc
IssuerGeoTrust RSA CA 2018
AlgorithmRSA-SHA256
Valid form04/10/2018
Expiration06/08/2020
SignedCertificate is not self signed
Additional Domains *.21tb.com
21tb.com
Server Location

ASN Information

ASN ID: 4808
ASN Title: CHINA169-BJ China Unicom Beijing Province Network, CN

Last Update: 04/21/2022

% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS4608 - AS4864'

as-block: AS4608 - AS4864
descr: APNIC ASN block
remarks: These AS numbers are further assigned by APNIC
remarks: to APNIC members and end-users in the APNIC region
admin-c: HM20-AP
tech-c: HM20-AP
mnt-by: APNIC-HM
mnt-lower: APNIC-HM
last-modified: 2008-09-04T06:40:26Z
source: APNIC

role: APNIC Hostmaster
address: 6 Cordelia Street
address: South Brisbane
address: QLD 4101
country: AU
phone: +61 7 3858 3100
fax-no: +61 7 3858 3199
e-mail: helpdesk@apnic.net
admin-c: AMS11-AP
tech-c: AH256-AP
nic-hdl: HM20-AP
remarks: Administrator for APNIC
notify: hostmaster@apnic.net
mnt-by: MAINT-APNIC-AP
last-modified: 2013-10-23T04:06:51Z
source: APNIC

% Information related to 'AS4808'

% Abuse contact for 'AS4808' is 'hqs-ipabuse@chinaunicom.cn'

aut-num: AS4808
as-name: CHINA169-BJ
descr: China Unicom Beijing Province Network
country: CN
member-of: AS4837:AS-CNCGROUP
import: from AS4837
action pref=100;
accept ANY
import: from AS9929
action pref=100;
accept AS4814
export: to AS4837
announce AS4808
export: to AS9929
announce AS4808
admin-c: CH1302-AP
tech-c: CH1302-AP
mnt-by: MAINT-CNCGROUP
mnt-irt: IRT-CU-CN
mnt-routes: MAINT-CNCGROUP-RR
last-modified: 2016-05-18T08:44:24Z
source: APNIC

irt: IRT-CU-CN
address: No.21,Financial Street
address: Beijing,100033
address: P.R.China
e-mail: hqs-ipabuse@chinaunicom.cn
abuse-mailbox: hqs-ipabuse@chinaunicom.cn
admin-c: CH1302-AP
tech-c: CH1302-AP
auth: # Filtered
mnt-by: MAINT-CNCGROUP
last-modified: 2017-10-23T05:59:13Z
source: APNIC

person: ChinaUnicom Hostmaster
nic-hdl: CH1302-AP
e-mail: hqs-ipabuse@chinaunicom.cn
address: No.21,Jin-Rong Street
address: Beijing,100033
address: P.R.China
phone: +86-10-66259764
fax-no: +86-10-66259764
country: CN
mnt-by: MAINT-CNCGROUP
last-modified: 2017-08-17T06:13:16Z
source: APNIC

% This query was served by the APNIC Whois Service version 1.88.15-46 (WHOIS-US4)

WHOIS

Domain Name: 21TB.COM
Registry Domain ID: 89388819_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.paycenter.com.cn
Registrar URL: http://www.xinnet.com
Updated Date: 2020-07-21T08:39:40Z
Creation Date: 2002-08-16T06:06:36Z
Registry Expiry Date: 2023-08-16T06:06:36Z
Registrar: Xin Net Technology Corporation
Registrar IANA ID: 120
Registrar Abuse Contact Email: supervision@xinnet.com
Registrar Abuse Contact Phone: +86.1087127926
Domain Status: ok https://icann.org/epp#ok
Name Server: 21TB-NS1.CNELN.NET
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2021-04-26T18:44:26Z


DNS Records
HostA RecordTTL
HostMX RecordPriorityTTL
21tb.commx-antispam.21tb.com103600
HostNS RecordTTL
HostTXT RecordTTL

Errors
Warnings

Last tested: 06/13/2017

Desktop
Desktop Speed
0%

Desktop Resource Breakdown
Total Resources94
Number of Hosts14
Static Resources80
JavaScript Resources19
CSS Resources8

Last tested: 08/27/2016

Mobile
Mobile Usability
98%
Mobile Speed
25%

Mobile Resource Breakdown
Total Resources91
Number of Hosts16
Static Resources70
JavaScript Resources26
CSS Resources9
www.21tb.com
www.21tb.net
www.21tb.org
www.21tb.info
www.21tb.biz
www.21tb.us
www.21tb.mobi
www.1tb.com
www.21tb.com
www.2tb.com
www.21b.com
www.21rb.com
www.21trb.com
www.21rtb.com
www.21fb.com
www.21tfb.com
www.21ftb.com
www.21gb.com
www.21tgb.com
www.21gtb.com
www.21yb.com
www.21tyb.com
www.21ytb.com
www.21t.com
www.21tv.com
www.21tbv.com
www.21tvb.com
www.21tg.com
www.21tbg.com
www.21th.com
www.21tbh.com
www.21thb.com
www.21tn.com
www.21tbn.com
www.21tnb.com
www.21tb.con