`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}
			PTR	`ip-39-96-153-42.defastlink.net`
		A	39.96.153.52^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-52.defastlink.net`
		A	47.118.199.202^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-202.defastlink.net`
		A	47.118.199.212^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-212.defastlink.net`
		A	120.76.107.42^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-42.defastlink.net`
		A	120.76.107.52^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-52.defastlink.net`
		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,}
			PTR	`ip-139-224-142-112.defastlink.net`
		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,}
			PTR	`ip-139-224-142-122.defastlink.net`
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}
			PTR	`ip-39-96-153-41.defastlink.net`
		A	39.96.153.51^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-51.defastlink.net`
		A	47.118.199.201^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-201.defastlink.net`
		A	47.118.199.211^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-211.defastlink.net`
		A	120.76.107.41^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-41.defastlink.net`
		A	120.76.107.51^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-51.defastlink.net`
		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,}
			PTR	`ip-139-224-142-111.defastlink.net`
		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,}
			PTR	`ip-139-224-142-121.defastlink.net`
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}
SOA	`dns15.hichina.com`hostmaster@hichina.com 2026-01-12 #9

`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

www.thirdclassroom.com

Same first word

thirdclassroom.com

DNS History

11 records (5 active, 6 former)

●NSdns15.hichina.com2026-02-28 → 2026-03-09 · 3 obs

○ 2018-08-19 03:09:18
● 2026-02-28 09:45:12
● 2026-03-09 05:03:54

●NSdns16.hichina.com2026-02-28 → 2026-03-09 · 3 obs

○ 2018-08-19 03:09:18
● 2026-02-28 09:45:12
● 2026-03-09 05:03:54

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

● 2015-06-25 23:33:04
○ 2016-01-28 19:35:58
○ 2026-03-09 05:03:54

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

● 2015-06-25 23:33:04
○ 2016-01-28 19:35:58
○ 2026-03-09 05:03:54

○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
○ 2026-03-09 05:03:54

○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
○ 2026-03-09 05:03:54

●MXmxbiz1.qq.com2018-08-19 → 2026-03-09 · 2 obs

● 2018-08-19 03:09:18
● 2026-03-09 05:03:54

●MXmxbiz2.qq.com2018-08-19 → 2026-03-09 · 2 obs

● 2018-08-19 03:09:18
● 2026-03-09 05:03:54

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

● 2015-11-07 21:43:54
○ 2016-01-28 19:35:58
○ 2026-03-09 05:03:54

○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
○ 2026-03-09 05:03:54

●A47.101.175.1062026-02-28 → 2026-03-09 · 3 obs

○ 2018-08-19 03:09:18
● 2026-02-28 09:45:12
● 2026-03-09 05:03:54

🔍 DNS Trace

Analysis

Hierarchy

The parent of www.thirdclassroom.com is thirdclassroom.com.

IP Addresses

thirdclassroom.com points to a single IP address: 47.101.175.106.

Other host names, for instance www.thirdclassroom.com, share IP numbers with thirdclassroom.com.

Name Servers

Two name servers dns15.hichina.com and dns16.hichina.com handle the delegation for thirdclassroom.com.

thirdclassroom.com shares the same name server setup as other domains, for example homeonline.info, yclxs.com.cn, wsnk.cn, mqfast.com and priseek.com.

thirdclassroom.com at least partially shares name servers with other domains, for example yshore.com, scotch.cn, jintexws.com, cztn.cn and ycggzyjy.com.

These name servers are often used together with expirens3.hichina.com and expirens4.hichina.com.

Host names with nine IP numbers: dns15.hichina.com points to: 2408:4009:501::23, 39.96.153.42, 39.96.153.52, 47.118.199.202, 47.118.199.212, 120.76.107.42, 120.76.107.52, 139.224.142.112 and 139.224.142.122; dns16.hichina.com points to: 2408:4009:501::24, 39.96.153.41, 39.96.153.51, 47.118.199.201, 47.118.199.211, 120.76.107.41, 120.76.107.51, 139.224.142.111 and 139.224.142.121.

Mail Servers

Two mail servers handle thirdclassroom.com: mxbiz1.qq.com and mxbiz2.qq.com.

thirdclassroom.com shares the same mail server setup as other domains, including weltune.com, seeyon.com, italentek.com, zgdushuapp.com and wakabaka.com.

thirdclassroom.com shares at least partially some mail servers with other domains, for instance ibmabb.com, mac.net.cn, zzty.net, xujia.net and casnetvi.com.

Host names with two IPs:

mxbiz1.qq.com resolves to 203.205.147.218 and 203.205.232.191.

Host names with one IP:

mxbiz2.qq.com resolves to 203.205.232.191.

Hosts resolving to 203.205.232.191: mxbiz1.qq.com and mxbiz2.qq.com.

thirdclassroom.com - robtex.com