`double-by.com`

DNSSEC	⚠️ Not signed
NS	`dns29.hichina.com` ⭐
		A	2408:4009:501::37^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.39^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.59^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.199^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.219^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.39^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.59^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.99^{🇨🇳 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	139.224.142.109^{🇨🇳 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	`dns30.hichina.com`
		A	2408:4009:501::38^{🇨🇳 Alibaba-Cloud2408:4009:501::/48}
		A	39.96.153.37^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	39.96.153.62^{🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC}
		A	47.118.199.197^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	47.118.199.221^{🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.}
		A	120.76.107.37^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	120.76.107.62^{🇨🇳 Alibaba-Cloud120.76.0.0/17}
		A	139.224.142.102^{🇨🇳 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	139.224.142.107^{🇨🇳 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	`us.mxhichina.com` ⭐
		A	205.204.114.131^{🇺🇸 Alibaba-Cloud205.204.96.0/19 Alibaba.com Inc. 400 S El Camino Real Suite 400 San Mateo, CA94402 US}
		A	205.204.114.132^{🇺🇸 Alibaba-Cloud205.204.96.0/19 Alibaba.com Inc. 400 S El Camino Real Suite 400 San Mateo, CA94402 US}
MX	`mxn.mxhichina.com`⁽⁵⁾
		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	`v=spf1 include:spf.mxhichina.com ~all`
SOA	`dns29.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=1776058567

Same first word

double-by.com

DNS History

7 records (5 active, 2 former)

●NSdns29.hichina.com2026-04-11 → 2026-04-13 · 3 obs

○ 2017-10-26 01:58:14
● 2026-04-11 01:45:44
● 2026-04-13 05:41:34

●NSdns30.hichina.com2026-04-11 → 2026-04-13 · 3 obs

○ 2017-10-26 01:58:14
● 2026-04-11 01:45:44
● 2026-04-13 05:41:34

○NSvip1.alidns.com2016-12-20 → 2017-10-26 · 4 obs

● 2016-12-20 00:11:06
● 2017-10-26 01:58:14
○ 2026-04-11 01:45:44
○ 2026-04-13 05:41:34

○NSvip2.alidns.com2016-12-20 → 2017-10-26 · 4 obs

● 2016-12-20 00:11:06
● 2017-10-26 01:58:14
○ 2026-04-11 01:45:44
○ 2026-04-13 05:41:34

●MXmxn.mxhichina.com2016-12-20 → 2026-04-13 · 2 obs

● 2016-12-20 00:11:06
● 2026-04-13 05:41:34

●MXmxw.mxhichina.com2016-12-20 → 2026-04-13 · 2 obs

● 2016-12-20 00:11:06
● 2026-04-13 05:41:34

●MXus.mxhichina.com2017-10-26 → 2026-04-13 · 3 obs

○ 2016-12-20 00:11:06
● 2017-10-26 01:58:14
● 2026-04-13 05:41:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
double-by.com	dns29.hichina.com, dns30.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.37

NS records: dns29.hichina.com, dns30.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for double-by.com (unsigned zone)

⏱️ Timing

Total: 3556ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`dns29.hichina.com, dns30.hichina.com`
MX	3	`us.mxhichina.com (pri: 1), mxw.mxhichina.com (pri: 10)...`
TXT	1	`v=spf1 include:spf.mxhichina.com ~all`
SOA	1	`dns29.hichina.com hostmaster.hichina.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns29.hichina.com, dns29.hichina.com, dns29.hichina.com...)

Analysis

Name Servers

Two name servers dns29.hichina.com and dns30.hichina.com handle the delegation for double-by.com.

double-by.com shares the same name server setup as other domains, for example gcare.cn, honghaissh.com, pvc520.com, monee.ltd and dajianzhi.com.

double-by.com at least partially shares name servers with other domains, for example collab.cn, pdwww.com, airmarket.com.cn, sylixos.com and dealsgift.com.

these name servers commonly pair with ns1.alidns.com, ns2.alidns.com, expirens3.hichina.com and expirens4.hichina.com.

Host names with nine IP numbers: dns29.hichina.com points to: 2408:4009:501::37, 39.96.153.39, 39.96.153.59, 47.118.199.199, 47.118.199.219, 120.76.107.39, 120.76.107.59, 139.224.142.99 and 139.224.142.109; dns30.hichina.com points to: 2408:4009:501::38, 39.96.153.37, 39.96.153.62, 47.118.199.197, 47.118.199.221, 120.76.107.37, 120.76.107.62, 139.224.142.102 and 139.224.142.107.

Mail Servers

double-by.com is handled by three mail servers: mxn.mxhichina.com, mxw.mxhichina.com and us.mxhichina.com.

double-by.com shares at least partially some mail servers with other domains, for instance boaibang.com, mdoom.com, 1078.com, vardig.com and fuwos.com.

these mail servers are commonly used with mx3.qiye.aliyun.com.

Host names with two IPs:

mxn.mxhichina.com points to 47.246.136.231 and 47.246.137.47.

us.mxhichina.com points to 205.204.114.131 and 205.204.114.132.

Host names with one IP:

mxw.mxhichina.com points to 47.246.99.195.

double-by.com - robtex.com

double-by.com

com