rclass.cz - robtex.com
rclass.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2001:1528:240::15🇨🇿 CASABLANCA-AS2001:1528::/32 Casablanca INT v6 network | ||||||
| PTR | krios.blueboard.cz | ||||||
| A | 217.11.249.139🇨🇿 CASABLANCA-AS217.11.248.0/23 Casablanca INT | ||||||
| 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@blueboard.cz 2012-10-03 #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=1774757837 | ||||||
Same first word
Similar names
DNS History
7 records (6 active, 1 former)
●NSjaguar.blueboard.cz2026-03-27 → 2026-03-29 · 3 obs
● 2026-03-27 13:15:46
● 2026-03-29 04:29:28
●NSns2.blueboard.cz2015-05-06 → 2026-03-29 · 2 obs
● 2026-03-29 04:29:28
●NSshinzon.blueboard.cz2015-05-06 → 2026-03-29 · 2 obs
● 2026-03-29 04:29:28
●MXjaguar.blueboard.cz2015-05-06 → 2026-03-29 · 2 obs
● 2026-03-29 04:29:28
○MXns2.blueboard.cz2015-05-06 → 2017-04-05 · 4 obs
● 2017-04-05 02:22:36
○ 2026-03-27 13:15:46
○ 2026-03-29 04:29:28
●A2001:1528:240::152015-05-06 → 2026-03-29 · 2 obs
● 2026-03-29 04:29:28
●A217.11.249.1392015-05-06 → 2026-03-29 · 2 obs
● 2026-03-29 04:29:28
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | c.ns.nic.cz, b.ns.nic.cz, a.ns.nic.cz, d.ns.nic.cz | - |
| rclass.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 rclass.cz (unsigned zone)
⏱️ Timing
Total: 471ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 217.11.249.139 |
| AAAA | 1 | 2001:1528:240::15 |
| NS | 2 | ns2.blueboard.cz, shinzon.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.blueboar |
📌 Glue Records Collected
Total: 3
Out-of-bailiwick: 3 (ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz)
Analysis
IP Addresses
rclass.cz resolves to two IP numbers: 2001:1528:240::15 and 217.11.249.139.
other host names including rid.cz, vasfilm.com, divetour.cz, staby.cz and hellmuth.cz share IP numbers with rclass.cz.
Name Servers
rclass.cz is delegated to three name servers jaguar.blueboard.cz, ns2.blueboard.cz and shinzon.blueboard.cz.
rclass.cz at least partially shares name servers with other domains, for instance spotless.cz, vrkoc.eu, trabantsraz.cz, hotelsrejber.cz and scrumadoption.com.
these name servers are commonly used alongside ns2.miniserver.cz.
Host names with two IP numbers:
jaguar.blueboard.cz points to: 2a00:1ed0:45::c and 178.251.187.8.
ns2.blueboard.cz points to: 2a01:4f8:13b:8d4::2 and 195.201.57.122.
shinzon.blueboard.cz points to: 2a00:1ed0:45::b and 178.251.187.7.
Mail Servers
rclass.cz is handled by a single mail server, jaguar.blueboard.cz.
rclass.cz shares the same mail server setup as other domains, for instance launchpad.cz, spaczechia.com, desineo.net, extra-finance.cz and gull.pl.
rclass.cz shares some mail servers with other domains, at least partially, for instance hochmanovi.cz, czdw.cz, technik-building.cz, yacco.cz and klimacentrum.cz.