51itstudy.com - dns.ninja

`51itstudy.com`

DNSSEC	⚠️ Not signed
A	120.24.22.199^{🇨🇳 Alibaba-Cloud120.24.0.0/16}
NS	`ns11.xincache.com` ⭐
		A	2402:4e00:1470:2::e^{🇨🇳 TENCENT-NET-AP2402:4e00:1400::/40}
		A	2402:4e00:1730::e^{🇨🇳 TENCENT-NET-AP2402:4e00:1700::/40}
		A	1.12.0.4^{🇨🇳 TENCENT-NET-AP-CN1.12.0.0/20 ZL-IDC-BOM}
		A	36.155.149.180^{🇨🇳 CMNET-Jiangsu-AP36.155.144.0/21 CMI (Customer Route)}
		A	112.80.181.45^{🇨🇳 CHINA169-Backbone112.80.0.0/13 China Unicom CHINA169 Jiangsu Province Network}
		A	117.89.178.173^{🇨🇳 ChinaNet-NANJING-JISHAN-IDC117.89.176.0/21 JS-CT NJ-JS-IDC}
		A	125.94.59.210^{🇨🇳 CHINANET-BACKBONE125.88.0.0/13 chinanet Guangdong network}
		A	129.211.176.209^{🇨🇳 TENCENT-NET-AP129.211.176.0/20}
NS	`ns12.xincache.com`
		A	2402:4e00:111:fff::c^{🇨🇳 TENCENT-NET-AP2402:4e00::/35}
		A	1.12.0.1^{🇨🇳 TENCENT-NET-AP-CN1.12.0.0/20 ZL-IDC-BOM}
		A	36.155.149.176^{🇨🇳 CMNET-Jiangsu-AP36.155.144.0/21 CMI (Customer Route)}
		A	112.80.181.111^{🇨🇳 CHINA169-Backbone112.80.0.0/13 China Unicom CHINA169 Jiangsu Province Network}
		A	117.89.178.184^{🇨🇳 ChinaNet-NANJING-JISHAN-IDC117.89.176.0/21 JS-CT NJ-JS-IDC}
		A	129.211.176.239^{🇨🇳 TENCENT-NET-AP129.211.176.0/20}
		A	163.177.5.23^{🇨🇳 UNICOM-GuangZhou-IDC163.177.5.0/24}
MX	`mxbiz1.qq.com` ⭐
MX	`mxbiz2.qq.com`⁽²⁰⁾
SOA	`ns11.xincache.com`enterprise1dnsadmin@dnspod.com serial=1591592923

`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=1783170171

Subdomains

www.51itstudy.com

Same first word

51itstudy.com

DNS History

12 records (5 active, 7 former)

●NSns11.xincache.com2015-06-02 → 2026-07-04 · 6 obs

○ 2008-03-10 23:17:50
● 2015-06-02 10:24:58
○ 2015-10-23 04:07:38
○ 2016-08-13 00:34:30
● 2017-03-28 09:45:36
● 2026-07-04 13:08:30

●NSns12.xincache.com2015-06-02 → 2026-07-04 · 6 obs

○ 2008-03-10 23:17:50
● 2015-06-02 10:24:58
○ 2015-10-23 04:07:38
○ 2016-08-13 00:34:30
● 2017-03-28 09:45:36
● 2026-07-04 13:08:30

○NSns17.xincache.com2015-10-23 → 2020-03-19 · 5 obs

○ 2015-06-02 10:24:58
● 2015-10-23 04:07:38
● 2020-03-19 10:49:34
○ 2026-03-01 14:22:06
○ 2026-07-04 13:08:30

○NSns18.xincache.com2015-10-23 → 2020-03-19 · 5 obs

○ 2015-06-02 10:24:58
● 2015-10-23 04:07:38
● 2020-03-19 10:49:34
○ 2026-03-01 14:22:06
○ 2026-07-04 13:08:30

○NSns3.dns-diy.com2008-03-10 → 2008-03-10 · 3 obs

● 2008-03-10 23:17:50
○ 2015-06-02 10:24:58
○ 2026-07-04 13:08:30

○NSns4.dns-diy.com2008-03-10 → 2008-03-10 · 3 obs

● 2008-03-10 23:17:50
○ 2015-06-02 10:24:58
○ 2026-07-04 13:08:30

●MXmxbiz1.qq.com2015-06-02 → 2026-07-04 · 3 obs

○ 2008-03-10 23:17:50
● 2015-06-02 10:24:58
● 2026-07-04 13:08:30

●MXmxbiz2.qq.com2015-06-02 → 2026-07-04 · 3 obs

○ 2008-03-10 23:17:50
● 2015-06-02 10:24:58
● 2026-07-04 13:08:30

○A115.28.137.1612015-06-02 → 2017-03-28 · 5 obs

○ 2008-03-10 23:17:50
● 2015-06-02 10:24:58
● 2017-03-28 09:45:36
○ 2026-03-01 14:22:06
○ 2026-07-04 13:08:30

●A120.24.22.1992026-03-01 → 2026-07-04 · 3 obs

○ 2017-03-28 09:45:36
● 2026-03-01 14:22:06
● 2026-07-04 13:08:30

○A219.129.239.1902008-03-10 → 2008-03-10 · 3 obs

● 2008-03-10 23:17:50
○ 2015-06-02 10:24:58
○ 2026-07-04 13:08:30

○CNAMEpeixun.chinaitlab.com2008-03-10 → 2008-03-10 · 3 obs

● 2008-03-10 23:17:50
○ 2015-06-02 10:24:58
○ 2026-07-04 13:08:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	e.gtld-servers.net, f.gtld-servers.net, h.gtld-servers.net, i.gtld-servers.net...	-
51itstudy.com	ns11.xincache.com, ns12.xincache.com	12 records

✅ Authoritative Response

Server:1.12.0.4

NS records: ns11.xincache.com, ns12.xincache.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51itstudy.com (unsigned zone)

⏱️ Timing

Total: 299ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`120.24.22.199`
NS	2	`ns12.xincache.com, ns11.xincache.com`
MX	2	`mxbiz1.qq.com (pri: 5), mxbiz2.qq.com (pri: 20)`
SOA	1	`ns11.xincache.com enterprise1dnsadmin.dn`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (ns11.xincache.com, ns11.xincache.com, ns11.xincache.com...)

Analysis

Hierarchy

51itstudy.com is a parent domain of www.51itstudy.com.

IP Addresses

51itstudy.com points to a single IP number: 120.24.22.199.

Other host names, such as www.51itstudy.com, share IP numbers with 51itstudy.com.

Name Servers

51itstudy.com is delegated to two name servers: ns11.xincache.com and ns12.xincache.com.

51itstudy.com shares its name server setup with other domains, including nbhaicheng.com, rp-cti.com, zgxy.gov.cn and two others.

51itstudy.com shares at least some of its name servers with other domains, including incepta.cn, smtw.com, chinasrif.com and two others.

These name servers are frequently seen alongside ns13.xincache.com, ns14.xincache.com, ns19.xincache.com and 7 other name servers.

Host names with 8 IP numbers:

ns11.xincache.com resolves to 1.12.0.4, 36.155.149.180, 112.80.181.45 and 5 other IP addresses.

Host names with 7 IP numbers:

ns12.xincache.com resolves to 1.12.0.1, 36.155.149.176, 112.80.181.111 and 4 other IP addresses.

Mail Servers

51itstudy.com has two mail servers: mxbiz1.qq.com and mxbiz2.qq.com.

51itstudy.com shares the same mail server setup as other domains, including amazingsys.com, csjtgl.com, rayjoyscm.com and two others.

51itstudy.com shares mail servers — at least in part — with other domains, including sippr.cn, wikifx.cc, cqyz.gov.cn and two others.