`21usb.com`

DNSSEC	⚠️ Not signed
A	119.28.91.173^{🇭🇰 TENCENT-NET-AP-CN119.28.90.0/23 Proxy-registered route object}
NS	`dns21.hichina.com` ⭐
		A	2408:4009:501::29^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.40^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.60^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.200^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.220^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.40^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.60^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.100^{🇨🇳 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	139.224.142.110^{🇨🇳 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	`dns22.hichina.com`
		A	2408:4009:501::30^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.38^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.61^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.198^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.222^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.38^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.61^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.98^{🇨🇳 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	139.224.142.108^{🇨🇳 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	`mx.ym.163.com` ⭐
		A	111.124.200.35^{🇨🇳 CHINANET-Guizhou-Guian-IDC111.124.192.0/19}
SOA	`dns21.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=1774580592

Subdomains

www.21usb.com

Same first word

21usb.com

Similar names

12bus.de

bus21.nl

sub21.com

sub12.de

sub12.net

12usb.com

sub12.com

DNS History

13 records (4 active, 9 former)

●NSdns21.hichina.com2026-03-22 → 2026-03-27 · 3 obs

○ 2018-07-25 03:16:34
● 2026-03-22 23:52:52
● 2026-03-27 03:16:36

●NSdns22.hichina.com2026-03-22 → 2026-03-27 · 3 obs

○ 2018-07-25 03:16:34
● 2026-03-22 23:52:52
● 2026-03-27 03:16:36

○NSns1.rejuvinate-medspa.com2008-03-13 → 2008-03-13 · 3 obs

● 2008-03-13 04:46:58
○ 2015-07-05 06:38:50
○ 2026-03-27 03:16:36

○NSns15.xincache.com2015-07-05 → 2018-07-25 · 5 obs

○ 2008-03-13 04:46:58
● 2015-07-05 06:38:50
● 2018-07-25 03:16:34
○ 2026-03-22 23:52:52
○ 2026-03-27 03:16:36

○NSns16.xincache.com2015-07-05 → 2018-07-25 · 5 obs

○ 2008-03-13 04:46:58
● 2015-07-05 06:38:50
● 2018-07-25 03:16:34
○ 2026-03-22 23:52:52
○ 2026-03-27 03:16:36

○NSns2.rejuvinate-medspa.com2008-03-13 → 2008-03-13 · 3 obs

● 2008-03-13 04:46:58
○ 2015-07-05 06:38:50
○ 2026-03-27 03:16:36

●MXmx.ym.163.com2026-03-22 → 2026-03-27 · 3 obs

○ 2018-07-25 03:16:34
● 2026-03-22 23:52:52
● 2026-03-27 03:16:36

○MXmxbiz1.qq.com2015-07-05 → 2018-07-25 · 5 obs

○ 2008-03-13 04:46:58
● 2015-07-05 06:38:50
● 2018-07-25 03:16:34
○ 2026-03-22 23:52:52
○ 2026-03-27 03:16:36

○MXmxbiz2.qq.com2015-07-05 → 2018-07-25 · 5 obs

○ 2008-03-13 04:46:58
● 2015-07-05 06:38:50
● 2018-07-25 03:16:34
○ 2026-03-22 23:52:52
○ 2026-03-27 03:16:36

●A119.28.91.1732026-03-22 → 2026-03-27 · 3 obs

○ 2018-07-25 03:16:34
● 2026-03-22 23:52:52
● 2026-03-27 03:16:36

○A121.42.67.1012015-07-05 → 2017-01-02 · 5 obs

○ 2008-03-13 04:46:58
● 2015-07-05 06:38:50
● 2017-01-02 21:45:40
○ 2018-07-25 03:16:34
○ 2026-03-27 03:16:36

○A192.126.123.1262018-07-25 → 2018-07-25 · 4 obs

○ 2017-01-02 21:45:40
● 2018-07-25 03:16:34
○ 2026-03-22 23:52:52
○ 2026-03-27 03:16:36

○A38.97.225.1352008-03-13 → 2008-03-13 · 3 obs

● 2008-03-13 04:46:58
○ 2015-07-05 06:38:50
○ 2026-03-27 03:16:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, b.gtld-servers.net, m.gtld-servers.net, a.gtld-servers.net...	-
21usb.com	dns21.hichina.com, dns22.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.38

NS records: dns21.hichina.com, dns22.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21usb.com (unsigned zone)

⏱️ Timing

Total: 3611ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`119.28.91.173`
NS	2	`dns22.hichina.com, dns21.hichina.com`
MX	1	`mx.ym.163.com (pri: 10)`
SOA	1	`dns21.hichina.com hostmaster.hichina.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns21.hichina.com, dns21.hichina.com, dns21.hichina.com...)

Analysis

Hierarchy

21usb.com is a parent of www.21usb.com.

IP Addresses

21usb.com points to a single IP number: 119.28.91.173.

Other host names such as 82ntc.com and www.21usb.com share IP numbers with 21usb.com.

Name Servers

Delegation for 21usb.com rests with two name servers, dns21.hichina.com and dns22.hichina.com.

21usb.com shares the same name server setup as other domains, including handit.com.cn, belove.cn, monian.info, antaike.cn and leiyangame.com.

21usb.com partially shares name servers with other domains; for instance yzajz.com and jectea.com.

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

Host names with nine IP numbers:

dns21.hichina.com points to: 2408:4009:501::29, 39.96.153.40, 39.96.153.60, 47.118.199.200, 47.118.199.220, 120.76.107.40, 120.76.107.60, 139.224.142.100 and 139.224.142.110.

dns22.hichina.com points to: 2408:4009:501::30, 39.96.153.38, 39.96.153.61, 47.118.199.198, 47.118.199.222, 120.76.107.38, 120.76.107.61, 139.224.142.98 and 139.224.142.108.

Mail Servers

21usb.com is handled by a single mail server, mx.ym.163.com.

21usb.com uses the same mail server configuration as other domains, such as cncoman.com, cmhoo.com, lgzjt.com, zhaodu.com and longmap.com.

21usb.com shares mail servers with other domains at least in part, for instance lookchem.cn, 56s.cn, ibookman.net, tnblt.com and bzxbtn.com.

these mail servers are commonly used with mxn.mxhichina.com, mxw.mxhichina.com and mxdomain.qq.com.

mx.ym.163.com points to a single IP: 111.124.200.35.

21usb.com - robtex.com

21usb.com

com

Subdomains

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`21usb.com`

`com`