`s21.cn`

DNSSEC	⚠️ Not signed
A	47.119.173.191^{🇨🇳 Alibaba-Cloud47.119.128.0/17 Alibaba (US) Technology Co., Ltd.}
NS	`dns27.hichina.com` ⭐
		A	2408:4009:501::35^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.39^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.59^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.199^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.219^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.39^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.59^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.99^{🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
		A	139.224.142.109^{🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
NS	`dns28.hichina.com`
		A	2408:4009:501::36^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.37^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.62^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.197^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.221^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.37^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.62^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.102^{🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
		A	139.224.142.107^{🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
MX	`mxbiz1.qq.com` ⭐
MX	`mxbiz2.qq.com` ⭐
SOA	`dns27.hichina.com`hostmaster@hichina.com 2026-05-12 #22

`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=2035003668

Same first word

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s21.me

s21.de

s21.eu

s21.cc

s21.mobi

s21.co.jp

s21.net

s21.info

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s21.com.cn

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s21.es

Similar names

s12.at

21s.net

s12.com.br

2s1.cn

12s.nl

21s.mobi

12s.de

s12.mobi

2s1.at

12s.org

s12.eu

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12s.co.uk

s12.gmbh

1s2.in

12s.com

21s.de

12s.pro

1s2.net

s12.com.co

s12.nl

12s.ch

s12.no

s12.co

s12.cz

21s.com

1s2.de

12s.vn

21s.org

s12.com

12s.info

12s.in

s12.net

21s.cc

21s.pl

s12.shop

s12.dk

2s1.org

1s2.com

1s2.co.uk

s12.in

s12.de

s12.org.ua

s12.ro

12s.eu

1s2.ru

s12.si

s12.hu

2s1.pl

21s.fr

s12.ax

21s.eu

12s.com.br

s12.ca

12s.net

21s.me

s12.pl

21s.cn

21s.ru

12s.gov.cn

1s2.org

1s2.at

2s1.net

DNS History

6 records (5 active, 1 former)

●NSdns27.hichina.com2026-05-30 → 2026-07-05 · 2 obs

● 2026-05-30 05:05:02
● 2026-07-05 00:30:44

●NSdns28.hichina.com2026-05-30 → 2026-07-05 · 2 obs

● 2026-05-30 05:05:02
● 2026-07-05 00:30:44

●MXmxbiz1.qq.com2026-07-03 → 2026-07-05 · 2 obs

● 2026-07-03 08:46:18
● 2026-07-05 00:30:44

●MXmxbiz2.qq.com2026-07-03 → 2026-07-05 · 2 obs

● 2026-07-03 08:46:18
● 2026-07-05 00:30:44

●A47.119.173.1912026-06-02 → 2026-07-05 · 2 obs

● 2026-06-02 13:30:46
● 2026-07-05 00:30:44

○CNAMEs21.cn.a1.initqq.com2026-05-30 → 2026-05-30 · 3 obs

● 2026-05-30 05:05:02
○ 2026-06-02 13:30:46
○ 2026-07-05 00:30:44

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	d.dns.cn, b.dns.cn, a.dns.cn, c.dns.cn...	-
s21.cn	dns27.hichina.com, dns28.hichina.com	-

✅ Authoritative Response

Server:120.76.107.37

NS records: dns27.hichina.com, dns28.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for s21.cn (unsigned zone)

⏱️ Timing

Total: 2149ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`47.119.173.191`
NS	2	`dns28.hichina.com, dns27.hichina.com`
MX	2	`mxbiz2.qq.com (pri: 10), mxbiz1.qq.com (pri: 10)`
SOA	1	`dns27.hichina.com hostmaster.hichina.com`

Analysis

IP Addresses

s21.cn has exactly one IP address — 47.119.173.191.

admin.52bi.cn, aislw.com, 888slw.cn and www.aislw.com are among the host names that share IP numbers with s21.cn.

Name Servers

s21.cn has two authoritative name servers — dns27.hichina.com and dns28.hichina.com.

The name server configuration of s21.cn is shared with other domains, for instance ccfabric.com, gofujian.com.cn, ryspc.com and two others.

s21.cn has at least partial name server overlap with other domains, such as yishangguoji.com.cn, o9f.com, jarvismed.com and two others.

expirens3.hichina.com, expirens4.hichina.com and dns1.hichina.com — plus 4 other name servers — are commonly paired with these name servers.

Hosts with 9 IP addresses each:

dns27.hichina.com points to 39.96.153.39, 39.96.153.59, 47.118.199.199 and 6 other IP addresses.

dns28.hichina.com points to 39.96.153.37, 39.96.153.62, 47.118.199.197 and 6 other IP addresses.

Mail Servers

s21.cn uses two mail servers, mxbiz1.qq.com and mxbiz2.qq.com.

The mail server setup of s21.cn matches that of other domains such as dx2.cn, aramex-china.cn, xmsmcj.com and two others.

At least some of the mail servers used by s21.cn are shared with other domains: frgiftcube.com, bikeng.com, coocpu.com and two others among them.

These mail servers tend to be used in combination with the mail servers mxn.mxhichina.com and mxw.mxhichina.com.

s21.cn - robtex.com

s21.cn

cn