Duobei.com 发现课程 - 多贝公开课

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Duobei.com Overview

Duobei.com ranking shows that the page is at position 60,315 over the world, while the bulk of its audience is from China, where it ranks 7,216.

It is beneficial to duobei.com that their hosting company IT7NET - IT7 Networks Inc, CA servers are located in China, as that reduces page load time for the majority of their users. See the list of other webpages hosted on IT7NET - IT7 Networks Inc, CA servers.

In terms of rank-to-traffic ratio, duobei.com has 2,416 unique users per day, viewing 11,587 pages. The rank based value of duobei.com is 208,138 USD. Every user makes 5.14 pageviews on average.

Duobei.com boasts a link base consisting of 288 referring domains and 311 external backlinks, as revealed by the data obtained from web network scanning.

Duobei.com top-level domain belongs to .COM domain zone. Check other webpages in .COM zone.

According the last verification test in November 14, 2019, duobei.com has an invalid SSL certificate. Click button “Update” SSL Information at the Safety Information section. Check the list of websites using SSL by DigiCert Inc.

Based on data from Google Safe Browsing, Google Safe Search, Symantec and Web of Trust duobei.com is a fairly safe domain.

According the Mobile-Friendly test by Google duobei.com is nice optimized for mobile devices and tablets.

Duobei.com Rank Summary

Global Rank

60,315

Average Load Time

4.10sec

Links In Count

253

Website Value

$192,720

Audience Geography. Where are duobei.com visitors located?

Country	Visitors
China CN	94.9%
Other	5.1%

Country	Pageviews
China CN	96.4%
Other	3.6%

Country	Rank
China CN	7216

Where do visitors go on duobei.com?

Subdomain	Pageviews
duobei.com	100%

Subdomain	Pageviews per User
duobei.com	4.4

Subdomain	Reach
duobei.com	100%

How popular is duobei.com?

Period	Global Rank	Global Rank Delta
past 3 months	60315	-9070
past month	63169	7593
past week	70087	14307
yesterday	77182	0

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	47943	-10339	13	26%	4.8	10%
30	52915	8791	12	-20.13%	4.4	-9.091%
7	61003	10430	1	-19.35%	4	6%
1	80763	0	8	0%	3	0%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	70233	-8842	10	10%
30	72403	7478	98	-12.18%
7	80025	17701	9	-24.11%
1	83705	0	9	0%

Duobei.com Website Safety

Overview

Last Updated: 01/10/2026

Overall result - duobei.com is safe.

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: 03/22/2025

duobei.com is safe.

Norton ConnectSafe evaluates duobei.com for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 10/20/2016

duobei.com is safe.

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

duobei.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: 02/23/2021

duobei.com is safe.

McAfee assesses duobei.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 duobei.com for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 01/10/2019

duobei.com child safety is very good.

The WOT calculates reputation of the duobei.com. This reputation system receives ratings from users and information from third-party sources, assesses the duobei.com for safety features and confirms, whether duobei.com is suitable for children.

SSL Information

SSL Checker Tool

WARNING!	Certificate download error. Previous scan results are shown below.
Domain	*.duobeiyun.com
Issuer Organization	DigiCert Inc
Issuer	GeoTrust RSA CA 2018
Algorithm	RSA-SHA256
Valid form	06/21/2018
Expiration	06/27/2020
Signed	Certificate is not self signed
Additional Domains	*.duobeiyun.com duobeiyun.com

Duobei.com Rank History

Alexa Rank shows how popular duobei.com is in comparison with other sites. The most popular site has Alexa Rank equals 1. If duobei.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 duobei.com and pageviews on duobei.com over the past 3 months.

Duobei.com Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 25820

ASN Title: IT7NET - IT7 Networks Inc, CA

Last Update: 12/15/2025

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 25820
ASName: IT7NET
ASHandle: AS25820
RegDate: 2013-01-15
Updated: 2013-01-15
Ref: https://rdap.arin.net/registry/autnum/25820

OrgName: IT7 Networks Inc
OrgId: IN-27
Address: 15216 North Bluff Road
Address: Suite 619
City: White Rock
StateProv: BC
PostalCode: V4B 0A7
Country: CA
RegDate: 2013-01-11
Updated: 2017-01-28
Ref: https://rdap.arin.net/registry/entity/IN-27

OrgNOCHandle: NOC12969-ARIN
OrgNOCName: NOC
OrgNOCPhone: +1-408-260-5757
OrgNOCEmail: arin-noc@sioru.com
OrgNOCRef: https://rdap.arin.net/registry/entity/NOC12969-ARIN

OrgAbuseHandle: ABUSE3623-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-408-260-5757
OrgAbuseEmail: abuse@sioru.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE3623-ARIN

OrgTechHandle: TECHN1201-ARIN
OrgTechName: Technical Contact
OrgTechPhone: +1-408-260-5757
OrgTechEmail: arin-tech@sioru.com
OrgTechRef: https://rdap.arin.net/registry/entity/TECHN1201-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Duobei.com Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: DUOBEI.COM
Registry Domain ID: 1202995027_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.paycenter.com.cn
Registrar URL: http://www.xinnet.com
Updated Date: 2020-08-08T08:43:03Z
Creation Date: 2007-09-07T13:04:16Z
Registry Expiry Date: 2025-09-07T13:04:16Z
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: N176.NS.YUNJIASU.COM
Name Server: N3100.NS.YUNJIASU.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-09-10T23:52:33Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL
duobei.com	210.73.212.102	300

Host	MX Record	Priority	TTL
duobei.com	mxbiz2.qq.com	10	300
duobei.com	mxbiz1.qq.com	5	300

Host	NS Record	TTL
duobei.com	n176.ns.yunjiasu.com	86400
duobei.com	n3100.ns.yunjiasu.com	86400

Host	TXT Record	TTL
duobei.com	v=spf1 include:spf.mail.qq.com include:mailgun.org -all	300

Duobei.com HTML Check

HTML Validation Tool

Errors

Almost standards mode doctype. Expected “<!DOCTYPE html>”.

The “charset” attribute on the “link” element is obsolete. Use an HTTP Content-Type header on the linked resource instead.

Warnings

The “type” attribute for the “style” element is not needed and should be omitted.

The “charset” attribute on the “script” element is obsolete.

The “type” attribute is unnecessary for JavaScript resources.

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

Duobei.com Desktop Performance

Last tested: 12/08/2019

Desktop Speed

91%

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

Optimize images

Leverage browser caching

Minify JavaScript

Desktop Resource Breakdown

Total Resources	22
Number of Hosts	5
Static Resources	19
JavaScript Resources	12
CSS Resources	2

Duobei.com Mobile Insights

Last tested: 01/20/2018

Mobile Usability

63%

Use legible font sizes

Size tap targets appropriately

Configure the viewport

Mobile Speed

70%

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

Optimize images

Reduce server response time

Leverage browser caching

Minify JavaScript

Mobile Resource Breakdown

Total Resources	35
Number of Hosts	6
Static Resources	28
JavaScript Resources	17
CSS Resources	2

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Duobei.com 发现课程 - 多贝公开课

【多贝网】公开课直播，名师与您在线分享学习视频，参加培训知识,了解最新动态，多贝网让您站在最前沿。

Duobei.com Overview

Duobei.com Rank Summary

Duobei.com Website Safety

Duobei.com Rank History

Duobei.com Hosting Information

Duobei.com Domain Registration and Settings

Duobei.com HTML Check

Duobei.com Desktop Performance

Duobei.com Mobile Insights

Duobei.com Similar Audits

Duobei.com Common Typos