optknu.edu.vn - robtex.com
optknu.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=2018565044 | ||||||
Subdomains
www.optknu.edu.vn |
Same first word
optknu.edu.vn |
Similar names
DNS History
7 records (7 active, 0 former)
●A216.239.32.212026-05-01 → 2026-05-11 · 2 obs
● 2026-05-11 10:16:32
●A216.239.34.212026-05-01 → 2026-05-11 · 2 obs
● 2026-05-11 10:16:32
●A216.239.36.212026-05-01 → 2026-05-11 · 2 obs
● 2026-05-11 10:16:32
●A216.239.38.212026-05-01 → 2026-05-11 · 2 obs
● 2026-05-11 10:16:32
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| vn | a.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn... | - |
| optknu.edu.vn | ns-b3.tenten.vn, ns-b2.tenten.vn, ns-b1.tenten.vn | - |
✅ Authoritative Response
Server:163.44.207.21
NS records: ns-b3.tenten.vn, ns-b2.tenten.vn, ns-b1.tenten.vn
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for optknu.edu.vn (unsigned zone)
⏱️ Timing
Total: 1848ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 4 | 216.239.38.21, 216.239.34.21... |
| NS | 3 | ns-b3.tenten.vn, ns-b1.tenten.vn... |
| TXT | 1 | google-site-verification=8eEAupoThPdrJb- |
| SOA | 1 | ns-b3.tenten.vn noreply.tenten.vn |
Analysis
Hierarchy
The parent of www.optknu.edu.vn is optknu.edu.vn.
IP Addresses
optknu.edu.vn maps to four IP numbers: 216.239.32.21, 216.239.34.21, 216.239.36.21 and 216.239.38.21.
Other host names such as americorp.info, championscanarias.com, gotyourbackoffice.biz, mikelangen.net and ennovesg.com share IPs with optknu.edu.vn.
Name Servers
optknu.edu.vn is delegated to three name servers: ns-b1.tenten.vn, ns-b2.tenten.vn and ns-b3.tenten.vn.
optknu.edu.vn at least partially shares name servers with other domains, for example hygtech.vn, giayphepthanhlapcongty.vn, ctjapan.vn, dktechgroup.vn and aromatide.com.vn.
Host names with two IP numbers:
ns-b1.tenten.vn points to 2404:f080:1101:321:a150:95:110:1230 and 137.59.104.67
ns-b2.tenten.vn points to 2404:f080:1101:321:a150:95:110:1231 and 137.59.104.68
ns-b3.tenten.vn points to 2404:f080:1101:321:a150:95:110:1232 and 163.44.207.21