htdclass.edu.vn - robtex.com
htdclass.edu.vn
edu.vn
| DNSSEC | ⚠️ Not signed | ||||||
| NS | dns-master.vnnic.vn ⭐ | ||||||
| NS | a.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | b.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | c.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | d.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | e.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | f.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | g.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| NS | h.dns-servers.vn ⚠️ Not in parent delegation | ||||||
| SOA | dns-master.vnnic.vnpostmaster@vnnic.vn serial=2018564899 | ||||||
Subdomains
Same first word
htdclass.edu.vn |
DNS History
8 records (8 active, 0 former)
●NSns-master.inet.vn2026-04-30 → 2026-05-11 · 2 obs
● 2026-05-11 00:18:40
●A202.92.4.282026-04-30 → 2026-05-11 · 2 obs
● 2026-05-11 00:18:40
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| vn | d.dns-servers.vn, h.dns-servers.vn, a.dns-servers.vn, c.dns-servers.vn... | - |
| htdclass.edu.vn | ns2.inet.vn, ns-master.inet.vn, ns1.inet.vn | - |
✅ Authoritative Response
Server:210.211.99.38
NS records: ns2.inet.vn, ns-master.inet.vn, ns1.inet.vn
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for htdclass.edu.vn (unsigned zone)
⏱️ Timing
Total: 1904ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 202.92.4.28 |
| NS | 3 | ns2.inet.vn, ns1.inet.vn... |
| MX | 3 | mx3.zoho.com (pri: 30), mx2.zoho.com (pri: 20)... |
| TXT | 3 | canva-domain-verify=66fa93eb-2ee7-4edb-b, v=spf1 include:zohomail.com ~all... |
| SOA | 1 | ns-master.inet.vn postmaster.inet.vn |
Analysis
Hierarchy
htdclass.edu.vn is a parent of ai.htdclass.edu.vn and www.htdclass.edu.vn.
IP Addresses
htdclass.edu.vn points to a single IP address: 202.92.4.28.
Other host names such as damynghethanhnhan.com.vn, dacsanngoclinh.com.vn, cocotravel.vn, vn.coachxhuy.com and dvclogistics.vn share IP numbers with htdclass.edu.vn.
Name Servers
htdclass.edu.vn is delegated to four name servers: ns-master.inet.vn, ns1.inet.vn, ns2.inet.vn and ns3.inet.vn.
At least part of the name servers for htdclass.edu.vn are shared with other domains, for instance vietanh.com.vn, aika.vn, vinhomeglobalgate.com.vn, keyen.vn and thpthoanhbo.edu.vn.
Two IP numbers per host:
ns1.inet.vn points to 2001:df7:ce00:1::7 and 202.92.4.25.
ns2.inet.vn points to 2401:5f80:2001:4::30 and 210.211.99.38.
ns3.inet.vn points to 2401:5f80:4001:4::14 and 203.113.174.42.
One IP number per host:
ns-master.inet.vn points to 202.92.4.8.
Mail Servers
Three mail servers handle htdclass.edu.vn: mx2.zoho.com, mx3.zoho.com and mx.zoho.com.
htdclass.edu.vn shares at least some mail servers with other domains, for example yiwu-sourcing-agent.com, gurutool.com, trentglobal.edu.sg, ouivita.com and connectfarmer.com.
Host names with two IP numbers:
The host name mx.zoho.com points to 136.143.191.44 and 204.141.33.44.
Host names with one IP number:
The host name mx2.zoho.com points to 204.141.33.44.
The host name mx3.zoho.com points to 136.143.191.44.
Host names pointing to 136.143.191.44:
Host names pointing to 204.141.33.44: