`51duoduo.com`

DNSSEC	⚠️ Not signed
A	172.247.185.118^{🇺🇸 CNSERVERSLLC172.247.185.0/24 Proxy-registered route object}
NS	`ns7.alidns.com` ⭐ ⚠️ Not in parent delegation
		A	2408:4009:501::3^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.47^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.57^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.207^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.217^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.47^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.57^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.117^{🇨🇳 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	139.224.142.127^{🇨🇳 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	`ns1.alidns.com` ⚠️ Not in zone NS records
		A	2408:4009:501::1^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.45^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-45.defastlink.net`
		A	39.96.153.55^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-55.defastlink.net`
		A	47.118.199.205^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-205.defastlink.net`
		A	47.118.199.215^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-215.defastlink.net`
		A	120.76.107.45^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-45.defastlink.net`
		A	120.76.107.55^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-55.defastlink.net`
		A	139.224.142.115^{🇨🇳 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-139-224-142-115.defastlink.net`
		A	139.224.142.125^{🇨🇳 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-139-224-142-125.defastlink.net`
NS	`ns2.alidns.com` ⚠️ Not in zone NS records
		A	2408:4009:501::2^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.46^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-46.defastlink.net`
		A	39.96.153.56^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-56.defastlink.net`
		A	47.118.199.206^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-206.defastlink.net`
		A	47.118.199.216^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-216.defastlink.net`
		A	120.76.107.46^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-46.defastlink.net`
		A	120.76.107.56^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-56.defastlink.net`
		A	139.224.142.116^{🇨🇳 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-139-224-142-116.defastlink.net`
		A	139.224.142.126^{🇨🇳 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-139-224-142-126.defastlink.net`
NS	`ns8.alidns.com` ⚠️ Not in parent delegation
		A	2408:4009:501::4^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.48^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.58^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.208^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.218^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.48^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.58^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.101^{🇨🇳 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	139.224.142.118^{🇨🇳 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,}
SOA	`ns7.alidns.com`hostmaster@hichina.com 2026-01-09 #13

`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.51duoduo.com

Same first word

51duoduo.com

DNS History

14 records (5 active, 9 former)

○NSdns10.hichina.com2015-07-23 → 2016-09-14 · 5 obs

○ 2008-03-15 20:22:24
● 2015-07-23 23:13:30
● 2016-09-14 08:22:50
○ 2026-03-14 17:33:56
○ 2026-03-23 01:36:50

○NSdns9.hichina.com2015-07-23 → 2016-09-14 · 5 obs

○ 2008-03-15 20:22:24
● 2015-07-23 23:13:30
● 2016-09-14 08:22:50
○ 2026-03-14 17:33:56
○ 2026-03-23 01:36:50

○NSns.edong.com2008-03-15 → 2008-03-15 · 3 obs

● 2008-03-15 20:22:24
○ 2015-07-23 23:13:30
○ 2026-03-23 01:36:50

●NSns1.alidns.com2026-03-14 → 2026-03-23 · 3 obs

○ 2016-09-14 08:22:50
● 2026-03-14 17:33:56
● 2026-03-23 01:36:50

○NSns1.edong.com2008-03-15 → 2008-03-15 · 3 obs

● 2008-03-15 20:22:24
○ 2015-07-23 23:13:30
○ 2026-03-23 01:36:50

●NSns2.alidns.com2026-03-14 → 2026-03-23 · 3 obs

○ 2016-09-14 08:22:50
● 2026-03-14 17:33:56
● 2026-03-23 01:36:50

●NSns7.alidns.com2026-03-14 → 2026-03-23 · 3 obs

○ 2016-09-14 08:22:50
● 2026-03-14 17:33:56
● 2026-03-23 01:36:50

●NSns8.alidns.com2026-03-14 → 2026-03-23 · 3 obs

○ 2016-09-14 08:22:50
● 2026-03-14 17:33:56
● 2026-03-23 01:36:50

○MXmail.51duoduo.com2008-03-15 → 2008-03-15 · 3 obs

● 2008-03-15 20:22:24
○ 2015-07-23 23:13:30
○ 2026-03-23 01:36:50

○MXmxn.mxhichina.com2015-07-23 → 2016-09-14 · 5 obs

○ 2008-03-15 20:22:24
● 2015-07-23 23:13:30
● 2016-09-14 08:22:50
○ 2026-03-14 17:33:56
○ 2026-03-23 01:36:50

○MXmxw.mxhichina.com2015-07-23 → 2016-09-14 · 5 obs

○ 2008-03-15 20:22:24
● 2015-07-23 23:13:30
● 2016-09-14 08:22:50
○ 2026-03-14 17:33:56
○ 2026-03-23 01:36:50

○A120.25.200.1132015-07-23 → 2016-09-14 · 5 obs

○ 2008-03-15 20:22:24
● 2015-07-23 23:13:30
● 2016-09-14 08:22:50
○ 2026-03-14 17:33:56
○ 2026-03-23 01:36:50

●A172.247.185.1182026-03-14 → 2026-03-23 · 3 obs

○ 2016-09-14 08:22:50
● 2026-03-14 17:33:56
● 2026-03-23 01:36:50

○A222.73.218.2172008-03-15 → 2008-03-15 · 3 obs

● 2008-03-15 20:22:24
○ 2015-07-23 23:13:30
○ 2026-03-23 01:36:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
51duoduo.com	ns1.alidns.com, ns2.alidns.com	18 records

✅ Authoritative Response

Server:120.76.107.46

NS records: ns1.alidns.com, ns2.alidns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 3827ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`172.247.185.118`
NS	2	`ns7.alidns.com, ns8.alidns.com`
SOA	1	`ns7.alidns.com hostmaster.hichina.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (ns1.alidns.com, ns1.alidns.com, ns1.alidns.com...)

Analysis

Hierarchy

51duoduo.com is parent of www.51duoduo.com.

IP Addresses

51duoduo.com points to a single IP: 172.247.185.118.

Other host names such as candylab.net and baobeiercn.com share IP numbers with 51duoduo.com.

Name Servers

51duoduo.com is delegated to four name servers: ns1.alidns.com, ns2.alidns.com, ns7.alidns.com and ns8.alidns.com.

51duoduo.com at least partially shares its name servers with other domains, for instance e042dfea81014.beer, zdh10311lo.com, 9857.cc, d3bc311b910311.beer and zhaoyuhua.com.

these name servers are commonly used with the name servers expirens3.hichina.com, expirens4.hichina.com, dns3.hichina.com, dns4.hichina.com, dns10.hichina.com and dns9.hichina.com.

Host names with nine IP numbers:

ns1.alidns.com points to: 2408:4009:501::1, 39.96.153.45, 39.96.153.55, 47.118.199.205, 47.118.199.215, 120.76.107.45, 120.76.107.55, 139.224.142.115 and 139.224.142.125.

ns2.alidns.com points to: 2408:4009:501::2, 39.96.153.46, 39.96.153.56, 47.118.199.206, 47.118.199.216, 120.76.107.46, 120.76.107.56, 139.224.142.116 and 139.224.142.126.

ns7.alidns.com points to: 2408:4009:501::3, 39.96.153.47, 39.96.153.57, 47.118.199.207, 47.118.199.217, 120.76.107.47, 120.76.107.57, 139.224.142.117 and 139.224.142.127.

ns8.alidns.com points to: 2408:4009:501::4, 39.96.153.48, 39.96.153.58, 47.118.199.208, 47.118.199.218, 120.76.107.48, 120.76.107.58, 139.224.142.101 and 139.224.142.118.

51duoduo.com - robtex.com

51duoduo.com

com

Subdomains

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

`51duoduo.com`

`com`