`doublebuilding.com`

DNSSEC	⚠️ Not signed
A	47.251.104.59^{🇺🇸 Alibaba-Cloud47.251.0.0/17 Proxy-registered route object}
NS	`dns7.hichina.com` ⭐
		A	2408:4009:501::15^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.43^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-43.defastlink.net`
		A	39.96.153.63^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-63.defastlink.net`
		A	47.118.199.203^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-203.defastlink.net`
		A	47.118.199.213^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-213.defastlink.net`
		A	120.76.107.43^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-43.defastlink.net`
		A	120.76.107.63^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-63.defastlink.net`
		A	139.224.142.113^{🇨🇳 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-139-224-142-113.defastlink.net`
		A	139.224.142.123^{🇨🇳 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-139-224-142-123.defastlink.net`
NS	`dns8.hichina.com`
		A	2408:4009:501::16^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.44^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-44.defastlink.net`
		A	39.96.153.54^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
			PTR	`ip-39-96-153-54.defastlink.net`
		A	47.118.199.204^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-204.defastlink.net`
		A	47.118.199.214^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
			PTR	`ip-47-118-199-214.defastlink.net`
		A	120.76.107.44^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-44.defastlink.net`
		A	120.76.107.54^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
			PTR	`ip-120-76-107-54.defastlink.net`
		A	139.224.142.114^{🇨🇳 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-139-224-142-114.defastlink.net`
		A	139.224.142.124^{🇨🇳 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-139-224-142-124.defastlink.net`
MX	`qiye163mx01.mxmail.netease.com` ⭐
		A	47.251.71.119^{🇺🇸 Alibaba-Cloud47.251.0.0/17 Proxy-registered route object}
		A	47.251.84.126^{🇺🇸 Alibaba-Cloud47.251.0.0/17 Proxy-registered route object}
MX	`qiye163mx02.mxmail.netease.com`⁽¹⁰⁾
		A	47.251.71.119^{🇺🇸 Alibaba-Cloud47.251.0.0/17 Proxy-registered route object}
		A	47.251.84.126^{🇺🇸 Alibaba-Cloud47.251.0.0/17 Proxy-registered route object}
TXT	`v=spf1 include:spf.163.com -all`
SOA	`dns7.hichina.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.doublebuilding.com

Same first word

doublebuilding.com

DNS History

11 records (5 active, 6 former)

○NSdns10.hichina.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 17:30:20
○ 2018-07-16 06:33:44
○ 2026-03-23 13:17:14

●NSdns7.hichina.com2026-02-23 → 2026-03-23 · 3 obs

○ 2018-07-16 06:33:44
● 2026-02-23 02:45:10
● 2026-03-23 13:17:14

●NSdns8.hichina.com2026-02-23 → 2026-03-23 · 3 obs

○ 2018-07-16 06:33:44
● 2026-02-23 02:45:10
● 2026-03-23 13:17:14

○NSdns9.hichina.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 17:30:20
○ 2018-07-16 06:33:44
○ 2026-03-23 13:17:14

○NSvip1.alidns.com2018-07-16 → 2018-07-16 · 4 obs

○ 2016-12-15 17:30:20
● 2018-07-16 06:33:44
○ 2026-02-23 02:45:10
○ 2026-03-23 13:17:14

○NSvip2.alidns.com2018-07-16 → 2018-07-16 · 4 obs

○ 2016-12-15 17:30:20
● 2018-07-16 06:33:44
○ 2026-02-23 02:45:10
○ 2026-03-23 13:17:14

●MXqiye163mx01.mxmail.netease.com2016-12-15 → 2026-03-23 · 2 obs

● 2016-12-15 17:30:20
● 2026-03-23 13:17:14

●MXqiye163mx02.mxmail.netease.com2016-12-15 → 2026-03-23 · 2 obs

● 2016-12-15 17:30:20
● 2026-03-23 13:17:14

○A122.10.84.672016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 17:30:20
○ 2018-07-16 06:33:44
○ 2026-03-23 13:17:14

●A47.251.104.592026-02-23 → 2026-03-23 · 3 obs

○ 2018-07-16 06:33:44
● 2026-02-23 02:45:10
● 2026-03-23 13:17:14

○A47.88.9.2472018-07-16 → 2018-07-16 · 4 obs

○ 2016-12-15 17:30:20
● 2018-07-16 06:33:44
○ 2026-02-23 02:45:10
○ 2026-03-23 13:17:14

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	f.gtld-servers.net, e.gtld-servers.net, h.gtld-servers.net, m.gtld-servers.net...	-
doublebuilding.com	dns7.hichina.com, dns8.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.43

NS records: dns7.hichina.com, dns8.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for doublebuilding.com (unsigned zone)

⏱️ Timing

Total: 3840ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`47.251.104.59`
NS	2	`dns7.hichina.com, dns8.hichina.com`
MX	2	`qiye163mx01.mxmail.netease.com (pri: 5), qiye163mx02.mxmail.netease.com (pri: 10)`
TXT	1	`v=spf1 include:spf.163.com -all`
SOA	1	`dns7.hichina.com hostmaster.hichina.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns7.hichina.com, dns7.hichina.com, dns7.hichina.com...)

Analysis

Hierarchy

www.doublebuilding.com is a child of doublebuilding.com.

IP Addresses

doublebuilding.com resolves to one IP number: 47.251.104.59.

Other host names, for instance www.honnypower.com, www.zfhousing.com, astarkitchen.com, syjwtkj.com and sftextiles.com share IP numbers with doublebuilding.com.

Name Servers

doublebuilding.com's delegation uses two name servers: dns7.hichina.com and dns8.hichina.com.

doublebuilding.com uses the same name server setup as other domains, such as jadenfurniture.com, deksep.com, 3150.cn, givatn.com and rezhanwang.com.

doublebuilding.com at least partially shares name servers with other domains, including treevip.com, fitone.info, 02102.cn, eqzt.com and fmcmotor.com.

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

Host names with nine IP numbers: The host name dns7.hichina.com points to 2408:4009:501::15, 39.96.153.43, 39.96.153.63, 47.118.199.203, 47.118.199.213, 120.76.107.43, 120.76.107.63, 139.224.142.113 and 139.224.142.123. The host name dns8.hichina.com points to 2408:4009:501::16, 39.96.153.44, 39.96.153.54, 47.118.199.204, 47.118.199.214, 120.76.107.44, 120.76.107.54, 139.224.142.114 and 139.224.142.124.

Mail Servers

doublebuilding.com is served by two mail servers qiye163mx01.mxmail.netease.com and qiye163mx02.mxmail.netease.com.

doublebuilding.com shares the same mail server setup as other domains, for instance reliance-seaborn.com, jnnano.com, yiyangzg.com, winguitar.com and bzjiehong.com.

doublebuilding.com shares at least some mail servers with other domains, for example javatech.cn, kingtai.net, cyypscl.com, szhtad.net and aesmedlaser.com.

Host names with two IP numbers

qiye163mx01.mxmail.netease.com points to 47.251.71.119 and 47.251.84.126.

qiye163mx02.mxmail.netease.com points to 47.251.71.119 and 47.251.84.126.

Names pointing to 47.251.71.119: qiye163mx01.mxmail.netease.com and qiye163mx02.mxmail.netease.com.

Names pointing to 47.251.84.126: qiye163mx01.mxmail.netease.com and qiye163mx02.mxmail.netease.com.

doublebuilding.com - robtex.com