mathcontest.vn - robtex.com
mathcontest.vn
| DNSSEC | ⚠️ Not signed | ||||||
| A | 103.138.113.227🇻🇳 ADSOTA-AS-VN103.138.113.0/24 APPOTA-VN | ||||||
| NS | ns1.bkdns.vn ⭐ | ||||||
| A | 2403:6a40:1:81::11:1🇻🇳 VNPT-AS-VN2403:6a40:1::/48 BKNS-VN | ||||||
| A | 103.48.81.11🇻🇳 VNPT-AS-VN103.48.80.0/22 BKNS-VN | ||||||
| PTR | ns1.bkdns.vn | ||||||
| NS | ns2.bkdns.vn | ||||||
| A | 2403:6a40:2000:247::220:1🇻🇳 BKNS-AS-VN2403:6a40:2000::/36 BKNS-VN | ||||||
| NS | ns3.bkdns.vn | ||||||
| A | 103.74.123.250🇻🇳 BKNS-AS-VN103.74.122.0/23 CNBKNS-VN | ||||||
| PTR | ns3.bkdns.vn | ||||||
| TXT | v=spf1 include:_spf.bkns.com.vn include:_netblocks6.bkns.com.vn ~all | ||||||
| SOA | ns1.bkdns.vnhostmaster@bkdns.vn 2020-09-30 #4 | ||||||
vn
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | dns-master.vnnic.vn ⭐ | ||||||
| NS | a.dns-servers.vn | ||||||
| NS | b.dns-servers.vn | ||||||
| NS | c.dns-servers.vn | ||||||
| NS | d.dns-servers.vn | ||||||
| NS | e.dns-servers.vn | ||||||
| NS | f.dns-servers.vn | ||||||
| NS | g.dns-servers.vn | ||||||
| NS | h.dns-servers.vn | ||||||
| SOA | dns-master.vnnic.vnpostmaster@vnnic.vn serial=2030765609 | ||||||
Subdomains
www.mathcontest.vn |
Same first word
mathcontest.vn |
Similar names
DNS History
4 records (4 active, 0 former)
●A103.138.113.2272026-05-01 → 2026-05-12 · 2 obs
● 2026-05-12 20:17:18
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| vn | f.dns-servers.vn, g.dns-servers.vn, h.dns-servers.vn, c.dns-servers.vn... | - |
| mathcontest.vn | ns3.bkdns.vn, ns2.bkdns.vn, ns1.bkdns.vn | 3 records |
✅ Authoritative Response
Server:103.74.123.250
NS records: ns3.bkdns.vn, ns2.bkdns.vn, ns1.bkdns.vn
🔒 DNSSEC Status
❌ Bogus (DNSSEC validation failed)
Validation error at vn: Error: DNS query timeout: 203.119.68.105 for DNSKEY vn
⏱️ Timing
Total: 3832ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 103.138.113.227 |
| NS | 3 | ns2.bkdns.vn, ns1.bkdns.vn... |
| TXT | 1 | v=spf1 include:_spf.bkns.com.vn include: |
| SOA | 1 | ns1.bkdns.vn hostmaster.bkdns.vn |
📌 Glue Records Collected
Total: 3
Out-of-bailiwick: 3 (ns1.bkdns.vn, ns2.bkdns.vn, ns3.bkdns.vn)
Analysis
Hierarchy
mathcontest.vn is a parent of www.mathcontest.vn.
IP Addresses
mathcontest.vn points to a single IP address: 103.138.113.227.
Other host names, for instance www.mathcontest.vn, share IP numbers with mathcontest.vn.
Name Servers
mathcontest.vn is delegated to three name servers: ns1.bkdns.vn, ns2.bkdns.vn and ns3.bkdns.vn.
At least part of the name servers for mathcontest.vn are shared with other domains, for instance bkns.vn, dennghethuatchauau.com, vatlydiachat.gov.vn, phanbonvbm.com and primehomes.vn.
Two IP numbers for a host name:
ns1.bkdns.vn points to 2403:6a40:1:81::11:1 and 103.48.81.11.
One IP number for a host name:
ns2.bkdns.vn points to 2403:6a40:2000:247::220:1.
ns3.bkdns.vn points to 103.74.123.250.