tutorial.cz - robtex.com
tutorial.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 87.236.195.92🇨🇿 COOLHOUSING-AS87.236.194.0/23 Network of Coolhousing | ||||||
| PTR | ns1.gradex.cz | ||||||
| NS | tutorial.cz ⭐ | ||||||
| A | 87.236.195.92🇨🇿 COOLHOUSING-AS87.236.194.0/23 Network of Coolhousing | ||||||
| PTR | ns1.gradex.cz | ||||||
| NS | ns1.gradex.cz | ||||||
| A | 87.236.195.92🇨🇿 COOLHOUSING-AS87.236.194.0/23 Network of Coolhousing | ||||||
| PTR | ns1.gradex.cz | ||||||
| NS | ns2.gradex.cz | ||||||
| A | 87.236.195.92🇨🇿 COOLHOUSING-AS87.236.194.0/23 Network of Coolhousing | ||||||
| PTR | ns1.gradex.cz | ||||||
| MX | mail.gradex.cz ⭐ | ||||||
| A | 87.236.195.93🇨🇿 COOLHOUSING-AS87.236.194.0/23 Network of Coolhousing | ||||||
| PTR | mail.gradex.com | ||||||
| SOA | tutorial.czradim@gradex.cz 2003-08-21 #0 | ||||||
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=1783178240 | ||||||
NS for
tutorial.cz |
Same first word
Similar names
DNS History
6 records (5 active, 1 former)
●NStutorial.cz2015-08-20 → 2026-07-04 · 2 obs
● 2026-07-04 16:11:56
○A217.11.249.262015-08-20 → 2017-08-16 · 4 obs
● 2017-08-16 18:58:00
○ 2026-02-19 01:53:04
○ 2026-07-04 16:11:56
●A87.236.195.922026-02-19 → 2026-07-04 · 3 obs
● 2026-02-19 01:53:04
● 2026-07-04 16:11:56
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| tutorial.cz | ns1.gradex.cz, ns2.gradex.cz | 2 records |
✅ Authoritative Response
Server:87.236.195.92
NS records: ns1.gradex.cz, ns2.gradex.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for tutorial.cz (unsigned zone)
⏱️ Timing
Total: 1463ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 87.236.195.92 |
| NS | 2 | ns1.gradex.cz, ns2.gradex.cz |
| MX | 1 | mail.gradex.cz (pri: 10) |
| SOA | 1 | tutorial.cz radim.gradex.cz |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns1.gradex.cz, ns2.gradex.cz)
Analysis
Name Server Role
tutorial.cz acts as a name server for tutorial.cz, meaning it is self-referentially delegated.
ns1.gradex.cz and ns2.gradex.cz are often used as name servers in combination with tutorial.cz.
IP Addresses
tutorial.cz resolves to one IP address: 87.236.195.92.
santisinvest.cz, cypherpunk.cz, indate.com and two other host names share IP numbers with tutorial.cz.
Name Servers
tutorial.cz has three authoritative name servers: tutorial.cz, ns1.gradex.cz and ns2.gradex.cz.
At least some of tutorial.cz's name servers are shared with other domains, for example cabopino.info, hotelcentrum.cz, cashnote.eu and two more.
These name servers are often deployed together with the name servers narexzdice.cz, tuni.cz, hotelolomouc.cz and vhodnydarek.cz.
Each of tutorial.cz, ns1.gradex.cz and ns2.gradex.cz has one IP address, which is 87.236.195.92.
The host names tutorial.cz, ns1.gradex.cz and ns2.gradex.cz each resolve to 87.236.195.92.
Mail Servers
Mail for tutorial.cz is handled by a single mail server, mail.gradex.cz.
tutorial.cz uses an identical mail server configuration to several other domains — among them cabopino.info, cashnote.eu, tuni.cz and two more.
mail.gradex.cz has exactly one IP number: 87.236.195.93.