btdesign.cz - robtex.com
btdesign.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.84.51🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | wpj.cz | ||||||
| NS | ns2.web4u.cz ⭐ | ||||||
| A | 2a02:a40:100:28ff::12🇨🇿 BlueTone-AS2a02:a40::/32 Ceske Radiokomunikace, a.s. | ||||||
| PTR | ns2.web4u.cz | ||||||
| A | 85.207.53.12🇨🇿 BlueTone-AS85.207.0.0/16 BlueTone-CRa-CZ Fourth address block | ||||||
| PTR | ns2.web4u.cz | ||||||
| NS | ns.web4u.cz | ||||||
| A | 2001:1568:fd::241🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | ns.web4u.cz | ||||||
| A | 185.14.224.241🇨🇿 WEB4U185.14.224.0/23 | ||||||
| PTR | ns.web4u.cz | ||||||
| MX | mail.btdesign.cz ⭐ | ||||||
| A | 81.91.84.51🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | wpj.cz | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2013-01-26 #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=1784872042 | ||||||
Subdomains
mail.btdesign.cz |
Same first word
btdesign.co.il |
btdesign.net.br |
btdesign.cz |
btdesign.com.br |
btdesign.site |
btdesign.pl |
btdesign.es |
btdesign.com |
btdesign.com.tr |
Similar names
DNS History
4 records (4 active, 0 former)
●MXmail.btdesign.cz2015-07-19 → 2026-07-24 · 2 obs
● 2026-07-24 06:29:56
●A81.91.84.512015-07-19 → 2026-07-24 · 2 obs
● 2026-07-24 06:29:56
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, d.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz | - |
| btdesign.cz | ns.web4u.cz, ns2.web4u.cz | 4 records |
✅ Authoritative Response
Server:185.14.224.241
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1458ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.84.51 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 1 | mail.btdesign.cz (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns.web4u.cz, ns2.web4u.cz, ns.web4u.cz...)
Analysis
Hierarchy
mail.btdesign.cz is delegated beneath btdesign.cz.
IP Addresses
btdesign.cz resolves to one IP address: 81.91.84.51.
mail.strelnicevrchlabi.cz, phtop.cz, mail.dsinfo.cz and two other host names share IP numbers with btdesign.cz.
Name Servers
Two name servers handle the delegation for btdesign.cz: ns2.web4u.cz and ns.web4u.cz.
btdesign.cz uses the same name servers as several other domains — among them mixa.es, dkl-tech.eu, photoexpedition.cz and two more.
ns2.web4u.cz and ns.web4u.cz both carry two IP addresses. The A records for ns2.web4u.cz are 85.207.53.12 and 2a02:a40:100:28ff::12; the A records for ns.web4u.cz are 185.14.224.241 and 2001:1568:fd::241.
Mail Servers
Mail for btdesign.cz is handled by a single mail server, mail.btdesign.cz.
mail.btdesign.cz carries a single IP number, which is 81.91.84.51.