courseczech.com - robtex.com
courseczech.com
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1774706152 | ||||||
Subdomains
www.courseczech.com |
Same first word
courseczech.com |
Similar names
DNS History
7 records (6 active, 1 former)
●NSns1.hosting90.cz2015-08-21 → 2026-03-28 · 2 obs
● 2026-03-28 14:14:56
●NSns1.hostingzdarma.cz2015-08-21 → 2026-03-28 · 2 obs
● 2026-03-28 14:14:56
●NSns2.hostingzdarma.cz2015-08-21 → 2026-03-28 · 2 obs
● 2026-03-28 14:14:56
●NSns3.hosting-zdarma.net2015-08-21 → 2026-03-28 · 2 obs
● 2026-03-28 14:14:56
○NSns4.hosting-zdarma.net2015-08-21 → 2018-06-28 · 4 obs
● 2018-06-28 06:09:02
○ 2026-03-28 14:14:54
○ 2026-03-28 14:14:56
●MXantispam.hosting-zdarma.cz2015-08-21 → 2026-03-28 · 2 obs
● 2026-03-28 14:14:56
●A194.135.92.1412015-08-21 → 2026-03-28 · 2 obs
● 2026-03-28 14:14:56
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| courseczech.com | ns1.hostingzdarma.cz, ns2.hostingzdarma.cz, ns3.hosting-zdarma.net | - |
✅ Authoritative Response
Server:185.65.223.35
NS records: ns1.hostingzdarma.cz, ns2.hostingzdarma.cz, ns3.hosting-zdarma.net
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for courseczech.com (unsigned zone)
⏱️ Timing
Total: 770ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 194.135.92.141 |
| NS | 3 | ns1.hostingzdarma.cz, ns3.hosting-zdarma.net... |
| MX | 1 | antispam.hosting-zdarma.cz (pri: 10) |
| SOA | 1 | ns1.hosting90.cz admin.hosting90.cz |
Analysis
Hierarchy
courseczech.com is the parent of www.courseczech.com.
IP Addresses
courseczech.com resolves to a single IP: 194.135.92.141.
Other host names, for instance, 5684.s.t4vps.eu and www.courseczech.com share IP numbers with courseczech.com.
Name Servers
courseczech.com is delegated to four name servers: ns1.hosting90.cz, ns1.hostingzdarma.cz, ns2.hostingzdarma.cz and ns3.hosting-zdarma.net.
courseczech.com shares some name servers with other domains, for example aduet.cz, powderline.cz, osum.cz, shirokan.cz and stavebniny-kovomat.cz.
These name servers are commonly used together with ns2.hosting90.cz and ns3.hosting90.net.
Host names with two IP numbers
Two IPs per host:
ns1.hosting90.cz points to 2a03:b780::1:1 and 130.193.8.82
ns1.hostingzdarma.cz points to 2a00:1e40:a:53::5 and 185.65.223.35
ns2.hostingzdarma.cz points to 2001:1ab0:7e1e:2::5 and 217.31.48.201
ns3.hosting-zdarma.net points to 2a03:b0c0:1:d0::1090:2001 and 178.62.60.201
Mail Servers
courseczech.com is handled by a single mail server, antispam.hosting-zdarma.cz.
courseczech.com shares the mail server setup with other domains, for example olamservis.cz, bezbetonu.cz, paintballciti.com, artservis.eu and hair-beauty.cz.
courseczech.com shares some mail servers with other domains, at least partially; for instance ekocov.cz, mse.cz, singingisfun.cz, stonozka.biz and ivoszlin.cz.
antispam.hosting-zdarma.cz resolves to four IPs: 2001:880:0:15::40a, 2001:1ab0:7e1f:1::1:9, 130.193.14.158 and 185.102.21.8.