ROBTEX.COM - challenge-21c.com

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challenge-21c.com checked at 2025-12-17T12:25:17.972Z 4685ms 120/120/120 100% R:21 allDone:true timedOut:false

challenge-21c.com

NSvip3.alidns.com
A2408:4009:500::3🇨🇳 Alibaba
A8.212.93.3🇭🇰 Alibaba_Cloud_SEC
A140.205.1.5🇨🇳 Alibaba
A170.33.32.210🇸🇬 Alibaba
A170.33.40.136🇸🇬 Alibaba_Cloud_SEC
A170.33.73.26🇸🇬 Alibaba
A170.33.80.10🇸🇬 Alibaba
NSvip4.alidns.com
A2408:4009:500::4🇨🇳 Alibaba
A8.212.93.4🇭🇰 Alibaba_Cloud_SEC
A140.205.1.6🇨🇳 Alibaba
A170.33.32.211🇸🇬 Alibaba
A170.33.40.137🇸🇬 Alibaba_Cloud_SEC
A170.33.73.27🇸🇬 Alibaba
A170.33.80.11🇸🇬 Alibaba
MXmxbiz1.qq.com
A103.86.78.2🇭🇰 HGC
A103.86.78.3🇭🇰 HGC
MXmxbiz2.qq.com
A43.154.252.16🇭🇰 Tencent Global
A43.154.252.202🇭🇰 Tencent Global

com

NSa.gtld-servers.net
NSb.gtld-servers.net
NSc.gtld-servers.net
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NSe.gtld-servers.net
NSf.gtld-servers.net
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NSm.gtld-servers.net

Up

mail.challenge-21c.com
pop.challenge-21c.com

Starts with same word

challenge-21c.co.jp
challenge-21c.com

Starts similarily

challenge-21c.co.jp
challenge-21c.com

AI analysis

challenge-21c.com is the parent of mail.challenge-21c.com and pop.challenge-21c.com.

challenge-21c.com has two name servers: vip3.alidns.com and vip4.alidns.com.

challenge-21c.com shares the same name server setup as other domains, for example tapsvc.com, uodoo.cn, haowujidian.com, unicompayment.com and ztn.com.

challenge-21c.com shares some name servers with other domains, for example wxianlai.com, tripcdn.cn, xylrs.com, tedu.cn and tianjinjuilliard.edu.cn.

Host names with seven IP numbers: The host name vip3.alidns.com points to 2408:4009:500::3, 8.212.93.3, 140.205.1.5, 170.33.32.210, 170.33.40.136, 170.33.73.26 and 170.33.80.10; the host name vip4.alidns.com points to 2408:4009:500::4, 8.212.93.4, 140.205.1.6, 170.33.32.211, 170.33.40.137, 170.33.73.27 and 170.33.80.11.

challenge-21c.com is served by two mail servers: mxbiz1.qq.com and mxbiz2.qq.com.

challenge-21c.com shares the mail server setup with other domains, for example ccer.pku.edu.cn, jgshome.com, pcvue.com.cn, qutj.com and bjtdty.com.

challenge-21c.com shares some mail servers with other domains, at least partially, for instance happytoon.cn, meinaide.com and fgloka.com.

Host names with two IP numbers:

mxbiz1.qq.com points to: 103.86.78.2 and 103.86.78.3; mxbiz2.qq.com points to: 43.154.252.16 and 43.154.252.202.