`chengcoach.com`

DNSSEC	⚠️ Not signed
A	58.248.0.203^{🇨🇳 CNCGROUP-GZ58.248.0.0/19 CMI (Customer Route)}
NS	`ns3.cnolnic.com` ⭐
		A	240c:4082:0:5d01::4^{🇨🇳 Baidu240c:4082::/32}
		A	106.12.205.190^{🇨🇳 Baidu106.12.192.0/20 AS38365}
		A	218.5.79.98^{🇨🇳 CHINATELECOM-Fujian-Xiamen-IDC1218.5.72.0/21 厦门}
NS	`ns4.cnolnic.com`
		A	240c:4082:0:5d01::5^{🇨🇳 Baidu240c:4082::/32}
		A	106.12.208.18^{🇨🇳 Baidu106.12.208.0/20 AS38365}
		A	218.5.79.117^{🇨🇳 CHINATELECOM-Fujian-Xiamen-IDC1218.5.72.0/21 厦门}
MX	`mxbiz1.qq.com` ⭐
		A	203.205.147.218^{🇭🇰 TENCENT-NET-AP-CN203.205.147.0/24 Proxy-registered route object}
		A	203.205.232.191^{🇭🇰 TENCENT-NET-AP-CN203.205.232.0/23 Proxy-registered route object}
MX	`mxbiz2.qq.com`⁽¹⁰⁾
		A	203.205.232.191^{🇭🇰 TENCENT-NET-AP-CN203.205.232.0/23 Proxy-registered route object}
TXT	`v=spf1 include:spf.mail.qq.com ~all`
SOA	`ns3.cnolnic.com`root@cnolnic.net 2006-11-24 #1

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1771291435

Subdomains

mail.chengcoach.com

demo.chengcoach.com

Same first word

chengcoach.com

DNS History

7 records (5 active, 2 former)

●NSns3.cnolnic.com2015-05-20 → 2026-03-14 · 2 obs

● 2015-05-20 13:38:38
● 2026-03-14 22:52:10

●NSns4.cnolnic.com2015-05-20 → 2026-03-14 · 2 obs

● 2015-05-20 13:38:38
● 2026-03-14 22:52:10

○MXmail.chengcoach.com2015-05-20 → 2016-05-04 · 4 obs

● 2015-05-20 13:38:38
● 2016-05-04 16:00:38
○ 2019-12-27 23:04:34
○ 2026-03-14 22:52:10

●MXmxbiz1.qq.com2019-12-27 → 2026-03-14 · 3 obs

○ 2016-05-04 16:00:38
● 2019-12-27 23:04:34
● 2026-03-14 22:52:10

●MXmxbiz2.qq.com2019-12-27 → 2026-03-14 · 3 obs

○ 2016-05-04 16:00:38
● 2019-12-27 23:04:34
● 2026-03-14 22:52:10

○A58.248.0.1982015-05-20 → 2015-05-20 · 3 obs

● 2015-05-20 13:38:38
○ 2015-10-28 13:31:34
○ 2026-03-14 22:52:10

●A58.248.0.2032015-10-28 → 2026-03-14 · 3 obs

○ 2015-05-20 13:38:38
● 2015-10-28 13:31:34
● 2026-03-14 22:52:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, g.gtld-servers.net, j.gtld-servers.net, i.gtld-servers.net...	-
chengcoach.com	ns3.cnolnic.com, ns4.cnolnic.com	6 records

✅ Authoritative Response

Server: 106.12.208.18

NS records: ns3.cnolnic.com, ns4.cnolnic.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for chengcoach.com (unsigned zone)

⏱️ Timing

Total: 615ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`58.248.0.203`
NS	2	`ns3.cnolnic.com, ns4.cnolnic.com`
MX	2	`mxbiz1.qq.com (pri: 5), mxbiz2.qq.com (pri: 10)`
TXT	1	`v=spf1 include:spf.mail.qq.com ~all`
SOA	1	`ns3.cnolnic.com root.cnolnic.net`

📌 Glue Records Collected

Total: 6

Out-of-bailiwick: 6 (ns3.cnolnic.com, ns3.cnolnic.com, ns3.cnolnic.com...)

Analysis

Hierarchy

chengcoach.com is parent of mail.chengcoach.com and demo.chengcoach.com.

IP Addresses

chengcoach.com resolves to a single IP address: 58.248.0.203.

Name Servers

chengcoach.com's delegation uses two name servers, ns3.cnolnic.com and ns4.cnolnic.com.

chengcoach.com shares the same name server setup as other domains, for example nhjm.cn, lygsmk.cn, zgltube.com, finra.cn and hr-china.com.cn.

chengcoach.com at least partially shares name servers with other domains, including xn--rss424d.com, molidao.com, ontimecn.com.cn, stjpba.com and xn--v4q51l27g6tjpias44iocj.com.

These name servers are commonly used with ns1.cnolnic.com and ns2.cnolnic.com.

Host names with three IPs:

ns3.cnolnic.com points to 240c:4082:0:5d01::4, 106.12.205.190 and 218.5.79.98

ns4.cnolnic.com points to 240c:4082:0:5d01::5, 106.12.208.18 and 218.5.79.117

Mail Servers

chengcoach.com is handled by two mail servers: mxbiz1.qq.com and mxbiz2.qq.com.

chengcoach.com shares its mail server setup with other domains, including mises.cn, sycline.com, hhdata.cn, 3cuc.com and mo298.com.

The mail servers for chengcoach.com are shared with other domains, for instance corecool.net, hengruiedu.com, shmen.com, tcloudbaseapp.com and medicret.com.

these mail servers are commonly used alongside the mail servers mxdomain.qq.com.

Host names with two IPs:

mxbiz1.qq.com points to 203.205.147.218 and 203.205.232.191.

Host names with one IP:

mxbiz2.qq.com points to 203.205.232.191.

Names pointing to 203.205.232.191:

mxbiz1.qq.com and mxbiz2.qq.com.

chengcoach.com - robtex.com

chengcoach.com

com