`i21.cn`

DNSSEC	⚠️ Not signed
NS	`ns1.cnolnic.net` ⭐
		A	240c:4082:0:5d01::6^{🇨🇳 Baidu240c:4082::/32}
		A	106.13.115.243^{🇨🇳 Baidu106.13.96.0/19 AS38365}
		A	106.13.136.254^{🇨🇳 Baidu106.13.128.0/19 AS38365}
NS	`ns2.cnolnic.net`
		A	240c:4082:0:5d01::7^{🇨🇳 Baidu240c:4082::/32}
		A	106.13.46.253^{🇨🇳 Baidu106.13.32.0/20 AS38365}
		A	218.5.79.189^{🇨🇳 CHINATELECOM-Fujian-Xiamen-IDC1218.5.72.0/21 厦门}
MX	`mx1.chengmail.cn` ⭐
		A	103.143.231.69^{🇭🇰 YISUCLOUDLTD-HK103.143.231.0/24 Hongkong Hongdou Technology Co., Limited FLAT/RM B07 23/F HOVER INDUSTRIAL BUILDING NO.26-38 KWAI CHEONG ROAO, NT}
		A	113.10.158.179^{🇭🇰 HKBNESL-AS-AP113.10.158.0/24 New World Telecommunications Limited Hong Kong Broadband Network Ltd 15/F, Trans Asia Centre 18 Kin Hong Street, Kwai Chung, N.T.}
MX	`mx2.chengmail.cn`⁽²⁰⁾
		A	103.143.231.69^{🇭🇰 YISUCLOUDLTD-HK103.143.231.0/24 Hongkong Hongdou Technology Co., Limited FLAT/RM B07 23/F HOVER INDUSTRIAL BUILDING NO.26-38 KWAI CHEONG ROAO, NT}
		A	113.10.158.179^{🇭🇰 HKBNESL-AS-AP113.10.158.0/24 New World Telecommunications Limited Hong Kong Broadband Network Ltd 15/F, Trans Asia Centre 18 Kin Hong Street, Kwai Chung, N.T.}
TXT	`v=spf1 include:spf.chengmail.cn ~all`
SOA	`ns1.cnolnic.net`root@cnolnic.net 2006-11-24 #1

`cn`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.dns.cn` ⭐
	NS	`b.dns.cn`
	NS	`c.dns.cn`
	NS	`d.dns.cn`
	NS	`e.dns.cn`
	NS	`ns.cernet.net` ⚠️ Not in parent delegation
	SOA	`a.dns.cn`root@cnnic.cn serial=2034660423

Same first word

i21.media

i21.org.br

i21.cn

i21.ru

i21.it

i21.mobi

i21.inf.br

i21.at

i21.co.th

i21.de

i21.co

i21.com.hk

i21.co.uk

i21.com

i21.in

i21.net

i21.eu

i21.jp

i21.com.cn

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12i.com

12i.de

i12.edu.ar

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21i.dev

12i.com.br

21i.pl

i12.ch

1i2.com.pl

21i.org

1i2.de

i12.cn

2i1.ru

12i.co

i12.info

2i1.de

i12.in

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1i2.biz

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1i2.eu

12i.biz

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12i.net

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DNS History

5 records (4 active, 1 former)

●NSns1.cnolnic.net2015-06-06 → 2026-04-11 · 2 obs

● 2015-06-06 20:44:22
● 2026-04-11 23:39:26

●NSns2.cnolnic.net2015-06-06 → 2026-04-11 · 2 obs

● 2015-06-06 20:44:22
● 2026-04-11 23:39:26

○MXeml-1.sitecname.com2015-06-06 → 2016-11-07 · 4 obs

● 2015-06-06 20:44:22
● 2016-11-07 18:34:28
○ 2026-03-26 15:50:32
○ 2026-04-11 23:39:26

●MXmx1.chengmail.cn2026-03-26 → 2026-04-11 · 3 obs

○ 2016-11-07 18:34:28
● 2026-03-26 15:50:32
● 2026-04-11 23:39:26

●MXmx2.chengmail.cn2026-03-26 → 2026-04-11 · 3 obs

○ 2016-11-07 18:34:28
● 2026-03-26 15:50:32
● 2026-04-11 23:39:26

🔍 DNS Trace

Analysis

Name Servers

i21.cn is delegated to two name servers: ns1.cnolnic.net and ns2.cnolnic.net.

i21.cn uses the same name server setup as other domains, for instance wmjs.net, hunanre.com, hxlq.com, bjgreatwall.cn and gwkx.com.

i21.cn partially shares name servers with other domains, for instance binte.cn.

Host names with three IP numbers: ns1.cnolnic.net points to 240c:4082:0:5d01::6, 106.13.115.243 and 106.13.136.254; ns2.cnolnic.net points to 240c:4082:0:5d01::7, 106.13.46.253 and 218.5.79.189.

Mail Servers

i21.cn is handled by two mail servers: mx1.chengmail.cn and mx2.chengmail.cn.

i21.cn shares the same mail server setup as other domains, including chipatom.com, zj96296.com, cis-inspection.com, dirsticker.com and homein-hk.com.

i21.cn shares some mail servers with other domains, including hirun-tech.com, 360cn.cn, arvr.cn, xnpfs.com and phonetrans.com.

Host names with two IPs:

mx1.chengmail.cn points to 103.143.231.69 and 113.10.158.179.

mx2.chengmail.cn points to 103.143.231.69 and 113.10.158.179.

Host names that point to 103.143.231.69: mx1.chengmail.cn and mx2.chengmail.cn.

Host names that point to 113.10.158.179: mx1.chengmail.cn and mx2.chengmail.cn.

Common IPs for mx1.chengmail.cn and mx2.chengmail.cn are 103.143.231.69 and 113.10.158.179.

i21.cn - robtex.com

i21.cn

cn