thirdclassroom.com - dns.ninja

`thirdclassroom.com`

DNSSEC	⚠️ Not signed
A	47.101.175.106^{🇨🇳 Alibaba-Cloud47.100.0.0/15}
NS	`dns15.hichina.com` ⭐
		A	2408:4009:501::23^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.42^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.52^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.202^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.212^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.42^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.52^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.112^{🇨🇳 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	139.224.142.122^{🇨🇳 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	`dns16.hichina.com`
		A	2408:4009:501::24^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.41^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.51^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.201^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.211^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.41^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.51^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.111^{🇨🇳 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	139.224.142.121^{🇨🇳 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`⁽¹⁰⁾
SOA	`dns15.hichina.com`hostmaster@hichina.com 2026-05-09 #12

`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=1786764114

Subdomains

www.thirdclassroom.com

Same first word

thirdclassroom.com

DNS History

11 records (5 active, 6 former)

●NSdns15.hichina.com2026-02-28 → 2026-08-15 · 3 obs

○ 2018-08-19 03:09:18
● 2026-02-28 09:45:12
● 2026-08-15 03:22:40

●NSdns16.hichina.com2026-02-28 → 2026-08-15 · 3 obs

○ 2018-08-19 03:09:18
● 2026-02-28 09:45:12
● 2026-08-15 03:22:40

○NSdns7.hichina.com2015-06-25 → 2015-06-25 · 3 obs

● 2015-06-25 23:33:04
○ 2016-01-28 19:35:58
○ 2026-08-15 03:22:40

○NSdns8.hichina.com2015-06-25 → 2015-06-25 · 3 obs

● 2015-06-25 23:33:04
○ 2016-01-28 19:35:58
○ 2026-08-15 03:22:40

○NSvip1.alidns.com2018-08-19 → 2018-08-19 · 4 obs

○ 2016-01-28 19:35:58
● 2018-08-19 03:09:18
○ 2026-02-28 09:45:12
○ 2026-08-15 03:22:40

○NSvip2.alidns.com2018-08-19 → 2018-08-19 · 4 obs

○ 2016-01-28 19:35:58
● 2018-08-19 03:09:18
○ 2026-02-28 09:45:12
○ 2026-08-15 03:22:40

●MXmxbiz1.qq.com2018-08-19 → 2026-08-15 · 2 obs

● 2018-08-19 03:09:18
● 2026-08-15 03:22:40

●MXmxbiz2.qq.com2018-08-19 → 2026-08-15 · 2 obs

● 2018-08-19 03:09:18
● 2026-08-15 03:22:40

○A112.125.17.1112015-11-07 → 2015-11-07 · 3 obs

● 2015-11-07 21:43:54
○ 2016-01-28 19:35:58
○ 2026-08-15 03:22:40

○A115.29.173.1182018-08-19 → 2018-08-19 · 4 obs

○ 2016-01-28 19:35:58
● 2018-08-19 03:09:18
○ 2026-02-28 09:45:12
○ 2026-08-15 03:22:40

●A47.101.175.1062026-02-28 → 2026-08-15 · 3 obs

○ 2018-08-19 03:09:18
● 2026-02-28 09:45:12
● 2026-08-15 03:22:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	e.gtld-servers.net, g.gtld-servers.net, l.gtld-servers.net, k.gtld-servers.net...	-
thirdclassroom.com	dns15.hichina.com, dns16.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.52

NS records: dns15.hichina.com, dns16.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for thirdclassroom.com (unsigned zone)

⏱️ Timing

Total: 540ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`47.101.175.106`
NS	2	`dns16.hichina.com, dns15.hichina.com`
MX	2	`mxbiz1.qq.com (pri: 5), mxbiz2.qq.com (pri: 10)`
SOA	1	`dns15.hichina.com hostmaster.hichina.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns15.hichina.com, dns15.hichina.com, dns15.hichina.com...)

Analysis

Hierarchy

The domain www.thirdclassroom.com falls under the parent thirdclassroom.com.

IP Addresses

thirdclassroom.com has exactly one IP address — 47.101.175.106.

Among the host names that share IP numbers with thirdclassroom.com is www.thirdclassroom.com, as one example.

Name Servers

The NS records for thirdclassroom.com delegate to dns15.hichina.com and dns16.hichina.com.

The name server configuration of thirdclassroom.com is shared with other domains, for instance yclxs.com.cn, wsnk.cn, zkwh-2024.cn and two others.

At least some of thirdclassroom.com's name servers are shared with other domains, for example bithome.cn, razjz.com, xy-arts.com and two more.

These name servers are often deployed together with the name servers expirens3.hichina.com, expirens4.hichina.com, ns1.alidns.com and ns2.alidns.com.

Hosts with 9 IP addresses each:

dns15.hichina.com maps to 39.96.153.42, 39.96.153.52, 47.118.199.202 and 6 additional IP addresses.

dns16.hichina.com maps to 39.96.153.41, 39.96.153.51, 47.118.199.201 and 6 additional IP addresses.

Mail Servers

thirdclassroom.com uses two mail servers, mxbiz1.qq.com and mxbiz2.qq.com.

The mail server setup of thirdclassroom.com matches that of other domains such as weltune.com, seeyon.com, zgdushuapp.com and two others.

At least some of the mail servers used by thirdclassroom.com are shared with other domains: ibmabb.com, mac.net.cn, zzty.net and two others among them.