preventive.cz - robtex.com
preventive.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 217.11.249.139🇨🇿 CASABLANCA-AS217.11.248.0/23 Casablanca INT | ||||||
| PTR | krios.blueboard.cz | ||||||
| NS | shinzon.blueboard.cz ⭐ | ||||||
| A | 2a00:1ed0:45::b🇨🇿 VSHOSTING2a00:1ed0::/32 | ||||||
| PTR | shinzon.blueboard.cz | ||||||
| A | 178.251.187.7🇨🇿 VSHOSTING178.251.184.0/21 | ||||||
| PTR | shinzon.blueboard.cz | ||||||
| NS | jaguar.blueboard.cz ⚠️ Not in zone NS records | ||||||
| A | 2a00:1ed0:45::c🇨🇿 VSHOSTING2a00:1ed0::/32 | ||||||
| PTR | jaguar.blueboard.cz | ||||||
| A | 178.251.187.8🇨🇿 VSHOSTING178.251.184.0/21 | ||||||
| PTR | jaguar.blueboard.cz | ||||||
| NS | ns2.blueboard.cz | ||||||
| A | 2a01:4f8:13b:8d4::2🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK | ||||||
| A | 195.201.57.122🇩🇪 Hetzner195.201.0.0/16 HETZNER-DC | ||||||
| PTR | ns2.blueboard.cz | ||||||
| MX | jaguar.blueboard.cz ⭐ | ||||||
| A | 2a00:1ed0:45::c🇨🇿 VSHOSTING2a00:1ed0::/32 | ||||||
| PTR | jaguar.blueboard.cz | ||||||
| A | 178.251.187.8🇨🇿 VSHOSTING178.251.184.0/21 | ||||||
| PTR | jaguar.blueboard.cz | ||||||
| TXT | v=spf1 a mx include:spf.blueboard.cz -all | ||||||
| SOA | shinzon.blueboard.czhostmaster@shinzon.blueboard.cz 2011-07-13 #3 | ||||||
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=1786614441 | ||||||
Same first word
Similar names
DNS History
6 records (5 active, 1 former)
●NSjaguar.blueboard.cz2026-04-10 → 2026-08-13 · 3 obs
● 2026-04-10 13:57:24
● 2026-08-13 09:50:06
●NSns2.blueboard.cz2015-07-13 → 2026-08-13 · 2 obs
● 2026-08-13 09:50:06
●NSshinzon.blueboard.cz2015-07-13 → 2026-08-13 · 2 obs
● 2026-08-13 09:50:06
●MXjaguar.blueboard.cz2015-07-13 → 2026-08-13 · 2 obs
● 2026-08-13 09:50:06
○MXns2.blueboard.cz2015-07-13 → 2017-02-19 · 4 obs
● 2017-02-19 15:16:02
○ 2026-04-10 13:57:24
○ 2026-08-13 09:50:06
●A217.11.249.1392015-07-13 → 2026-08-13 · 2 obs
● 2026-08-13 09:50:06
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | - |
| preventive.cz | ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz | 3 records |
✅ Authoritative Response
Server:178.251.187.8
NS records: ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for preventive.cz (unsigned zone)
⏱️ Timing
Total: 2139ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 217.11.249.139 |
| NS | 2 | shinzon.blueboard.cz, ns2.blueboard.cz |
| MX | 1 | jaguar.blueboard.cz (pri: 10) |
| TXT | 1 | v=spf1 a mx include:spf.blueboard.cz -al |
| SOA | 1 | shinzon.blueboard.cz hostmaster.shinzon. |
📌 Glue Records Collected
Total: 3
Out-of-bailiwick: 3 (ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz)
Analysis
IP Addresses
preventive.cz directs to one IP number, which is 217.11.249.139.
Among the host names that share IP numbers with preventive.cz are urybicky.cz, marek.biz, rdmont.cz and two others.
Name Servers
DNS for preventive.cz is handled by three authoritative name servers: jaguar.blueboard.cz, ns2.blueboard.cz and shinzon.blueboard.cz.
preventive.cz has at least partial name server overlap with other domains, such as hinton.cz, flodr.cz, suchy-zleb.cz and two others.
It is common to find these name servers paired with the name servers ns2.miniserver.cz.
Three hostnames — jaguar.blueboard.cz, ns2.blueboard.cz and shinzon.blueboard.cz — each have two IP addresses: jaguar.blueboard.cz has 178.251.187.8 and 2a00:1ed0:45::c, ns2.blueboard.cz has 195.201.57.122 and 2a01:4f8:13b:8d4::2, and shinzon.blueboard.cz has 178.251.187.7 and 2a00:1ed0:45::b.
Mail Servers
preventive.cz routes its mail through a single mail server, jaguar.blueboard.cz.
preventive.cz has the same mail server arrangement as a number of other domains, for example webkoder.cz, ddct.cz, 4family.cz and two more.
preventive.cz shares at least some of its mail servers with other domains — for example airmovie.cz, cysecteam.com, menucesky.cz and two more.