`sdlearningtech.cn`

DNSSEC	⚠️ Not signed
A	221.214.61.26^{🇨🇳 CHINA169-Backbone221.214.0.0/15 CNC Group CHINA169 Shandong Province Network}
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	`mxbiz1.qq.com` ⭐
MX	`mxbiz2.qq.com`⁽¹⁰⁾
SOA	`dns29.hichina.com`hostmaster@hichina.com 2026-01-12 #9

`cn`

	DNSSEC	⚠️ Not signed
	NS	`a.dns.cn` ⭐
	NS	`b.dns.cn`
	NS	`c.dns.cn`
	NS	`d.dns.cn`
	NS	`e.dns.cn`
	NS	`ns.cernet.net` ⚠️ Not in parent delegation
	SOA	`a.dns.cn`root@cnnic.cn serial=2034710435

Subdomains

www.sdlearningtech.cn

Same first word

sdlearningtech.cn

DNS History

5 records (5 active, 0 former)

●NSdns29.hichina.com2026-02-24 → 2026-04-25 · 2 obs

● 2026-02-24 23:32:48
● 2026-04-25 10:03:30

●NSdns30.hichina.com2026-02-24 → 2026-04-25 · 2 obs

● 2026-02-24 23:32:48
● 2026-04-25 10:03:30

●MXmxbiz1.qq.com2026-02-24 → 2026-04-25 · 2 obs

● 2026-02-24 23:32:48
● 2026-04-25 10:03:30

●MXmxbiz2.qq.com2026-02-24 → 2026-04-25 · 2 obs

● 2026-02-24 23:32:48
● 2026-04-25 10:03:30

●A221.214.61.262026-02-24 → 2026-04-25 · 2 obs

● 2026-02-24 23:32:48
● 2026-04-25 10:03:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	a.dns.cn, e.dns.cn, b.dns.cn, d.dns.cn...	-
sdlearningtech.cn	dns29.hichina.com, dns30.hichina.com	-

✅ Authoritative Response

Server:120.76.107.39

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for sdlearningtech.cn (unsigned zone)

⏱️ Timing

Total: 1895ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`221.214.61.26`
NS	2	`dns29.hichina.com, dns30.hichina.com`
MX	2	`mxbiz1.qq.com (pri: 5), mxbiz2.qq.com (pri: 10)`
SOA	1	`dns29.hichina.com hostmaster.hichina.com`

Analysis

Hierarchy

sdlearningtech.cn is the parent of www.sdlearningtech.cn.

IP Addresses

sdlearningtech.cn resolves to a single IP address: 221.214.61.26.

Name Servers

sdlearningtech.cn's delegation uses two name servers, dns29.hichina.com and dns30.hichina.com.

sdlearningtech.cn shares the same name server setup as other domains, for example pharmaframe.com, hao123abc.com, dayitc.com, acw99.com and chinayimeng.org.cn.

sdlearningtech.cn at least partially shares name servers with other domains, including ttmy.cn, miechong.net, kz622.cn, easyard.com and ruibi.net.

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

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

sdlearningtech.cn is handled by two mail servers: mxbiz1.qq.com and mxbiz2.qq.com.

sdlearningtech.cn shares its mail server setup with other domains, including tpsensor.com, shhc.cn, annag.cn, my3.cn and shangshow.com.cn.

sdlearningtech.cn shares some mail servers with other domains, for instance mengsky.net, overseaen.com, nhgre.com and eduholiday.com.

sdlearningtech.cn - robtex.com