`bbblackboard.com`

DNSSEC	⚠️ Not signed
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	`mxn.mxhichina.com` ⭐
		A	47.246.136.231^{🇺🇸 Alibaba-Cloud47.246.136.0/22 Alibaba CLoud}
			PTR	`cz-clare.com`
			PTR	`reachsmartdwell.com`
			PTR	`wevolt.tech`
		A	47.246.137.47^{🇺🇸 Alibaba-Cloud47.246.136.0/22 Alibaba CLoud}
MX	`mxw.mxhichina.com`⁽¹⁰⁾
		A	47.246.99.195^{🇺🇸 Alibaba-Cloud47.246.96.0/22 Proxy-registered route object}
			PTR	`reachsmartdwell.com`
TXT	`_globalsign-domain-verification=9NsG9R5XfilBkqrlEFZbxkxYQeE6eDbkmcEFPjH81b`
TXT	`_globalsign-domain-verification=0ibj3Vq151NXtHp6yWUcbXb0SP9X4RHpCL9tHA4gsO`
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=1774589672

Same first word

bbblackboard.com

DNS History

4 records (4 active, 0 former)

●NSdns21.hichina.com2026-03-09 → 2026-03-27 · 2 obs

● 2026-03-09 19:55:24
● 2026-03-27 06:03:02

●NSdns22.hichina.com2026-03-09 → 2026-03-27 · 2 obs

● 2026-03-09 19:55:24
● 2026-03-27 06:03:02

●MXmxn.mxhichina.com2026-03-09 → 2026-03-27 · 2 obs

● 2026-03-09 19:55:24
● 2026-03-27 06:03:02

●MXmxw.mxhichina.com2026-03-09 → 2026-03-27 · 2 obs

● 2026-03-09 19:55:24
● 2026-03-27 06:03:02

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	i.gtld-servers.net, g.gtld-servers.net, j.gtld-servers.net, k.gtld-servers.net...	-
bbblackboard.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 bbblackboard.com (unsigned zone)

⏱️ Timing

Total: 3876ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`dns21.hichina.com, dns22.hichina.com`
MX	2	`mxw.mxhichina.com (pri: 10), mxn.mxhichina.com (pri: 5)`
TXT	2	`_globalsign-domain-verification=0ibj3Vq1, _globalsign-domain-verification=9NsG9R5X`
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

Name Servers

bbblackboard.com has two name servers: dns21.hichina.com and dns22.hichina.com.

bbblackboard.com shares the same name server setup as other domains, for example globleb.com, progpaul.com, qzxysp.com, ciin.cn and yuejutown.com.

bbblackboard.com partially shares name servers with other domains, for instance taobao.cc.

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

bbblackboard.com is served by two mail servers: mxn.mxhichina.com and mxw.mxhichina.com.

bbblackboard.com shares the mail server setup with other domains, for example bjlmjc.com, ainuok.com, ysylr.com, yhyvm.com and sofang.com.

bbblackboard.com shares some mail servers with other domains, at least partially; for instance bljtcw.com, myclassnow.com, gpisen.com, shnitpwr.com and san-e.net.

these mail servers are commonly used alongside mx3.qiye.aliyun.com, mx1.qiye.aliyun.com and mx2.qiye.aliyun.com.

Host names with two IP numbers: mxn.mxhichina.com points to: 47.246.136.231 and 47.246.137.47.

Host names with one IP number: mxw.mxhichina.com points to: 47.246.99.195.

bbblackboard.com - robtex.com