tutorial.cz - dns.ninja
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=1780908437 | ||||||
NS for
tutorial.cz |
Same first word
Similar names
DNS History
6 records (5 active, 1 former)
●NStutorial.cz2015-08-20 → 2026-06-08 · 2 obs
● 2026-06-08 09:14:10
○A217.11.249.262015-08-20 → 2017-08-16 · 4 obs
● 2017-08-16 18:58:00
○ 2026-02-19 01:53:04
○ 2026-06-08 09:14:10
●A87.236.195.922026-02-19 → 2026-06-08 · 3 obs
● 2026-02-19 01:53:04
● 2026-06-08 09:14:10
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | c.ns.nic.cz, d.ns.nic.cz, a.ns.nic.cz, b.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: 625ms | 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 is listed as a name server for tutorial.cz — it is in-bailiwick, authoritative for its own domain.
ns1.gradex.cz and ns2.gradex.cz frequently appear as name servers alongside tutorial.cz.
IP Addresses
tutorial.cz has exactly one IP address — 87.236.195.92.
santisinvest.cz, cypherpunk.cz, indate.com plus two other host names have IP numbers in common with tutorial.cz.
Name Servers
The NS records for tutorial.cz list three name servers: tutorial.cz, ns1.gradex.cz and ns2.gradex.cz.
tutorial.cz shares at least some of its name servers with other domains, including cabopino.info, hotelcentrum.cz, cashnote.eu and two others.
These name servers are frequently seen alongside the name servers narexzdice.cz, tuni.cz, hotelolomouc.cz and vhodnydarek.cz.
The hosts tutorial.cz, ns1.gradex.cz and ns2.gradex.cz each direct to 87.236.195.92; one IP address covers all three.
Three host names point to 87.236.195.92: tutorial.cz, ns1.gradex.cz and ns2.gradex.cz.
Mail Servers
tutorial.cz uses one mail server — mail.gradex.cz.
The mail server setup of tutorial.cz matches that of other domains such as cabopino.info, cashnote.eu, tuni.cz and two others.
mail.gradex.cz resolves to 87.236.195.93 and no other IP number.