undertheflag.cz - robtex.com
undertheflag.cz
cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.ns.nic.cz ⭐ | ||||||
| NS | b.ns.nic.cz | ||||||
| NS | c.ns.nic.cz | ||||||
| NS | d.ns.nic.cz | ||||||
| SOA | a.ns.nic.czhostmaster@nic.cz serial=1776106033 | ||||||
Subdomains
mailin1.undertheflag.cz |
messenger.undertheflag.cz |
mailin2.undertheflag.cz |
webmail.undertheflag.cz |
box.undertheflag.cz |
Same first word
undertheflag.cz |
DNS History
11 records (6 active, 5 former)
○NSalfa.ns.active24.cz2017-12-15 → 2017-12-15 · 3 obs
○ 2026-03-24 18:31:56
○ 2026-04-13 19:06:12
○NSbeta.ns.active24.cz2017-12-15 → 2017-12-15 · 3 obs
○ 2026-03-24 18:31:56
○ 2026-04-13 19:06:12
○NSgama.ns.active24.sk2017-12-15 → 2017-12-15 · 3 obs
○ 2026-03-24 18:31:56
○ 2026-04-13 19:06:12
●NSns1.websupport.cz2026-03-24 → 2026-04-13 · 3 obs
● 2026-03-24 18:31:56
● 2026-04-13 19:06:12
●NSns2.websupport.cz2026-03-24 → 2026-04-13 · 3 obs
● 2026-03-24 18:31:56
● 2026-04-13 19:06:12
●NSns3.websupport.eu2026-03-24 → 2026-04-13 · 3 obs
● 2026-03-24 18:31:56
● 2026-04-13 19:06:12
●MXmailin1.undertheflag.cz2026-03-24 → 2026-04-13 · 3 obs
● 2026-03-24 18:31:56
● 2026-04-13 19:06:12
●MXmailin2.undertheflag.cz2026-03-24 → 2026-04-13 · 3 obs
● 2026-03-24 18:31:56
● 2026-04-13 19:06:12
○MXmx1.active24.com2017-12-15 → 2017-12-15 · 3 obs
○ 2026-03-24 18:31:56
○ 2026-04-13 19:06:12
○MXmx2.active24.com2017-12-15 → 2017-12-15 · 3 obs
○ 2026-03-24 18:31:56
○ 2026-04-13 19:06:12
●A91.239.202.1502017-12-15 → 2026-04-13 · 2 obs
● 2026-04-13 19:06:12
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| undertheflag.cz | ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu | - |
✅ Authoritative Response
Server:45.10.97.13
NS records: ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1060ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 91.239.202.150 |
| NS | 3 | ns1.websupport.cz, ns2.websupport.cz... |
| MX | 2 | mailin1.undertheflag.cz (pri: 10), mailin2.undertheflag.cz (pri: 100) |
| TXT | 1 | v=spf1 mx 138.68.101.34 include:mailgun. |
| SOA | 1 | ns1.websupport.cz admin.websupport.cz |
Analysis
Hierarchy
undertheflag.cz is a parent of mailin1.undertheflag.cz, messenger.undertheflag.cz, mailin2.undertheflag.cz, webmail.undertheflag.cz and box.undertheflag.cz.
IP Addresses
undertheflag.cz resolves to one IP number: 91.239.202.150.
Other host names, for instance cestapivnichznalcu.cz, hanil.cz and replikant549.thinline.cz share IP numbers with undertheflag.cz.
Name Servers
undertheflag.cz is delegated to three name servers ns1.websupport.cz, ns2.websupport.cz and ns3.websupport.eu.
undertheflag.cz at least partially shares name servers with other domains, for instance hcwerk.cz, studak.cz, krbalek.cz, webpropag.cz and drupalarts.com.
These name servers are commonly used with ns1.websupport.sk, ns2.websupport.sk and ns3.websupport.sk.
Host names with two IP numbers:
ns1.websupport.cz points to: 2a10:bbc0::11 and 45.10.97.11.
ns2.websupport.cz points to: 2a02:250:3::12 and 185.71.159.12.
ns3.websupport.eu points to: 2a10:bbc0::13 and 45.10.97.13.
Mail Servers
Two mail servers handle undertheflag.cz: mailin1.undertheflag.cz and mailin2.undertheflag.cz.
Host names with two IP numbers:
The host name mailin1.undertheflag.cz points to 2a00:4b40:aaaa:2101:45:13:137:105 and 45.13.137.8; the host name mailin2.undertheflag.cz points to 2a00:4b40:aaaa:2101:45:13:137:104 and 45.13.137.104.