21tb.com 时代光华-企业数智化学习服务商-企业在线学习平台-企业培训平台-E-learning在线学习平台

时代光华是一家专业的企业在线学习以及企业数智化学习服务商，致力于为企业提供全方位的人才培养、组织管理、市场销售等方面的专业培训服务。

21tb.com Overview

Website Overview: 21tb.com

Website Name: 21tb.com

Website Title: 时代光华官网

Website Description:

时代光华 is a web-based organizational learning solution provider. Their main service is elearning, with additional services covering content, platform, customized courseware software, mobile learning, multimedia products, teaching materials, open classes, in-house training, and organizational learning consulting services.

Website Traffic:

The website receives approximately 21,884 unique users per day with 109,420 pageviews. This indicates a significant amount of daily traffic to the site.

Website Hosting:

The website is hosted by CHINA169-BJ China Unicom Beijing Province Network, indicating the hosting location in Beijing, China. This suggests that the target audience may primarily be located in China.

Domain:

The website uses a top-level domain of .COM, which is a generic domain commonly used worldwide.

SSL Certificate:

The SSL certificate for the website is issued by DigiCert Inc, ensuring secure communication between the website and its users.

Family-Friendly:

To determine if the site is family-friendly, further information is required. Based solely on the provided information, it is not possible to confirm the family-friendliness of the site.

PageSpeed Insights Scores:

The PageSpeed Insights score for the website is 25. This indicates that the website may have room for improvement in terms of page loading speed and performance optimization.

Backlinks:

The website has a significant number of external backlinks, totaling 1,488. Backlinks are important for search engine optimization (SEO) and can contribute to the website's visibility and authority.

Referring Domains:

There are 1,101 referring domains to the website. Referring domains are websites that include links to the analyzed site. This suggests that the website has gained recognition and has been linked from various sources on the internet.

Overall, 21tb.com is a web-based organizational learning solution provider with a substantial daily traffic and a range of services related to elearning. The website is hosted in China, and it has a decent number of backlinks and referring domains. However, there is room for improvement in terms of page loading speed and performance optimization.

21tb.com Rank Summary

Global Rank

Average Load Time

0.00sec

Links In Count

Website Value

$63,180

Audience Geography. Where are 21tb.com visitors located?

Country	Visitors

Country	Pageviews

Country	Rank

Where do visitors go on 21tb.com?

Subdomain	Pageviews

Subdomain	Pageviews per User

Subdomain	Reach

How popular is 21tb.com?

Period	Global Rank	Global Rank Delta

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta

21tb.com Website Safety

Overview

Last Updated: 12/26/2024

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: 03/22/2024

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: 12/26/2024

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: 12/26/2024

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

SSL Checker Tool

Domain	*.21tb.com
Issuer Organization	DigiCert Inc
Issuer	GeoTrust RSA CN CA G3
Algorithm	RSA-SHA256
Valid form	06/04/2024
Expiration	07/05/2025
Signed	Certificate is not self signed
Additional Domains	*.21tb.com 21tb.com

21tb.com Rank History

Alexa Rank shows how popular 21tb.com is in comparison with other sites. The most popular site has Alexa Rank equals 1. If 21tb.com has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to 21tb.com and pageviews on 21tb.com over the past 3 months.

21tb.com Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 4808

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

Last Update: 07/18/2024

% [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)

21tb.com Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

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: 2022-06-14T07:18:06Z
Creation Date: 2002-08-16T06:06:36Z
Registry Expiry Date: 2025-08-16T06:06:36Z
Registrar: Xin Net Technology Corporation
Registrar IANA ID: 120
Registrar Abuse Contact Email: supervision@xinnet.com
Registrar Abuse Contact Phone: +86.4008182233
Domain Status: ok https://icann.org/epp#ok
Name Server: NS1.21TB.COM
Name Server: NS2.21TB.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-09-12T03:09:46Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL

Host	MX Record	Priority	TTL
21tb.com	mx-antispam.21tb.com	10	3600

Host	NS Record	TTL

Host	TXT Record	TTL

21tb.com HTML Check

HTML Validation Tool

Errors

Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.

Attribute “itemprop” not allowed on element “meta” at this point.

The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.

The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.

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

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

Attribute “hidefocus” not allowed on element “a” at this point.

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

No space between attributes.

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

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

The “valign” attribute on the “td” element is obsolete. Use CSS instead.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The “font” element is obsolete. Use CSS instead.

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

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

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

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

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

The “valign” attribute on the “tr” element is obsolete. Use CSS instead.

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

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

The “width” attribute on the “table” element is obsolete. Use CSS instead.

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

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

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

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

Attribute “_ltype” not allowed on element “a” at this point.

Attribute “_lide” not allowed on element “a” at this point.

Attribute “_lname” not allowed on element “a” at this point.

Too many messages.

Warnings

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

21tb.com Desktop Performance

Last tested: 06/13/2017

Desktop Speed

Optimize images

Leverage browser caching

Enable compression

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

Minify CSS

Minify JavaScript

Minify HTML

Desktop Resource Breakdown

Total Resources	94
Number of Hosts	14
Static Resources	80
JavaScript Resources	19
CSS Resources	8

21tb.com Mobile Insights

Last tested: 08/27/2016

Mobile Usability

98%

Size tap targets appropriately

Mobile Speed

25%

Optimize images

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

Leverage browser caching

Enable compression

Minify JavaScript

Minify CSS

Minify HTML

Mobile Resource Breakdown

Total Resources	91
Number of Hosts	16
Static Resources	70
JavaScript Resources	26
CSS Resources	9

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21tb.com 时代光华-企业数智化学习服务商-企业在线学习平台-企业培训平台-E-learning在线学习平台

时代光华是一家专业的企业在线学习以及企业数智化学习服务商，致力于为企业提供全方位的人才培养、组织管理、市场销售等方面的专业培训服务。

21tb.com Overview

21tb.com Rank Summary

21tb.com Website Safety

21tb.com Rank History

21tb.com Hosting Information

21tb.com Domain Registration and Settings

21tb.com HTML Check

21tb.com Desktop Performance

21tb.com Mobile Insights

21tb.com Similar Audits

21tb.com Common Typos