knowledgebase.cz - dns.ninja
knowledgebase.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 137.74.53.183🇫🇷 OVH137.74.0.0/16 | ||||||
| PTR | cluster.ownmyserver.com | ||||||
| NS | ns210.ownmyserver.com ⭐ ⚠️ Not in parent delegation | ||||||
| A | 137.74.53.180🇫🇷 OVH137.74.0.0/16 | ||||||
| PTR | cluster.ownmyserver.com | ||||||
| NS | ns1.vexcor.systems ⚠️ Not in zone NS records | ||||||
| A | 137.74.53.183🇫🇷 OVH137.74.0.0/16 | ||||||
| PTR | cluster.ownmyserver.com | ||||||
| NS | ns2.vexcor.systems ⚠️ Not in zone NS records | ||||||
| A | 137.74.53.183🇫🇷 OVH137.74.0.0/16 | ||||||
| PTR | cluster.ownmyserver.com | ||||||
| NS | ns211.ownmyserver.com ⚠️ Not in parent delegation | ||||||
| A | 178.32.67.56🇫🇷 OVH178.32.0.0/15 ISP Paris, France | ||||||
| PTR | cluster3.ownmyserver.com | ||||||
| MX | knowledgebase.cz ⭐ | ||||||
| A | 137.74.53.183🇫🇷 OVH137.74.0.0/16 | ||||||
| PTR | cluster.ownmyserver.com | ||||||
| TXT | v=spf1 +a +mx +ip4:51.91.218.217 ~all | ||||||
| SOA | ns210.ownmyserver.comcxsalerts@gmail.com 2026-06-08 #1 | ||||||
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=1784440041 | ||||||
MX for
knowledgebase.cz |
Previously MX for
mail.knowledgebase.cz |
Subdomains
mail.knowledgebase.cz |
Same first word
Similar names
DNS History
10 records (6 active, 4 former)
●NSns1.vexcor.systems2017-06-08 → 2026-07-19 · 6 obs
● 2017-06-08 09:46:04
● 2026-06-13 02:12:04
○ 2026-06-27 01:37:50
● 2026-07-08 08:55:18
● 2026-07-19 06:25:52
○NSns1.vexlink.cz2016-02-01 → 2016-11-25 · 4 obs
● 2016-11-25 20:17:34
○ 2017-06-08 09:46:04
○ 2026-07-19 06:25:52
●NSns2.vexcor.systems2017-06-08 → 2026-07-19 · 6 obs
● 2017-06-08 09:46:04
● 2026-06-13 02:12:04
○ 2026-06-27 01:37:50
● 2026-07-08 08:55:18
● 2026-07-19 06:25:52
○NSns2.vexlink.cz2016-02-01 → 2016-11-25 · 4 obs
● 2016-11-25 20:17:34
○ 2017-06-08 09:46:04
○ 2026-07-19 06:25:52
●NSns210.ownmyserver.com2026-03-18 → 2026-07-19 · 6 obs
● 2026-03-18 10:36:16
● 2026-04-08 16:14:44
○ 2026-06-13 02:12:04
● 2026-07-08 08:55:18
● 2026-07-19 06:25:52
●NSns211.ownmyserver.com2026-03-18 → 2026-07-19 · 6 obs
● 2026-03-18 10:36:16
● 2026-04-08 16:14:44
○ 2026-06-13 02:12:04
● 2026-07-08 08:55:18
● 2026-07-19 06:25:52
●MXknowledgebase.cz2016-02-01 → 2026-07-19 · 5 obs
● 2026-04-08 16:14:44
○ 2026-06-13 02:12:04
● 2026-07-08 08:55:18
● 2026-07-19 06:25:52
●A137.74.53.1832026-03-18 → 2026-07-19 · 6 obs
● 2026-03-18 10:36:16
● 2026-04-08 16:14:44
○ 2026-06-13 02:12:04
● 2026-07-08 08:55:18
● 2026-07-19 06:25:52
○A185.46.121.1032016-02-01 → 2016-11-25 · 4 obs
● 2016-11-25 20:17:34
○ 2017-06-08 09:46:04
○ 2026-07-19 06:25:52
○A5.196.64.562017-06-08 → 2017-06-08 · 4 obs
● 2017-06-08 09:46:04
○ 2026-03-18 10:36:16
○ 2026-07-19 06:25:52
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| knowledgebase.cz | ns2.vexcor.systems, ns1.vexcor.systems | - |
✅ Authoritative Response
Server:137.74.53.183
NS records: ns2.vexcor.systems, ns1.vexcor.systems
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for knowledgebase.cz (unsigned zone)
⏱️ Timing
Total: 1543ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 137.74.53.183 |
| NS | 2 | ns210.ownmyserver.com, ns211.ownmyserver.com |
| MX | 1 | knowledgebase.cz (pri: 0) |
| TXT | 1 | v=spf1 +a +mx +ip4:51.91.218.217 ~all |
| SOA | 1 | ns210.ownmyserver.com cxsalerts.gmail.co |
Analysis
Hierarchy
The domain mail.knowledgebase.cz falls under the parent knowledgebase.cz.
Mail Server Role
knowledgebase.cz acts as its own mail server.
IP Addresses
knowledgebase.cz points to a single IP number: 137.74.53.183.
Additional host names — zahrady-hajek.cz, mayurpulley.com, vexcor.systems and two others — share IP numbers with knowledgebase.cz.
Name Servers
knowledgebase.cz has four authoritative name servers: ns210.ownmyserver.com, ns211.ownmyserver.com, ns1.vexcor.systems and ns2.vexcor.systems.
At least some of knowledgebase.cz's name servers are shared with other domains, for example mayurpulley.com, vexcor.systems, fedcut.org and two more.
These name servers are often deployed together with the name servers ns76.ownmyserver.com, ns77.ownmyserver.com, ns29.ownmyserver.com and ns30.ownmyserver.com.
ns210.ownmyserver.com points to 137.74.53.180. ns211.ownmyserver.com points to 178.32.67.56. ns1.vexcor.systems and ns2.vexcor.systems both point to 137.74.53.183. Each of the four hosts has exactly one IP address.
The host names ns1.vexcor.systems and ns2.vexcor.systems both resolve to 137.74.53.183 IP addresses.
Mail Servers
knowledgebase.cz has a single mail server: knowledgebase.cz itself.
knowledgebase.cz points to one IP number — 137.74.53.183.