petrstyblo.com - robtex.com
petrstyblo.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.86.12🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | php53.web4u.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 | mx.web4u.cz ⭐ | ||||||
| A | 2001:1568::7012🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | mx.web4u.cz | ||||||
| A | 81.91.87.12🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | mx.web4u.cz | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2013-01-07 #1 | ||||||
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=1774722637 | ||||||
Same first word
petrstyblo.com |
DNS History
5 records (4 active, 1 former)
○MXmail.petrstyblo.com2015-08-19 → 2017-07-02 · 4 obs
● 2017-07-02 21:37:10
○ 2026-02-23 01:01:58
○ 2026-03-28 18:47:34
●MXmx.web4u.cz2026-02-23 → 2026-03-28 · 3 obs
● 2026-02-23 01:01:58
● 2026-03-28 18:47:34
●A81.91.86.122015-08-19 → 2026-03-28 · 2 obs
● 2026-03-28 18:47:34
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| petrstyblo.com | ns.web4u.cz, ns2.web4u.cz | - |
✅ Authoritative Response
Server:185.14.224.241
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for petrstyblo.com (unsigned zone)
⏱️ Timing
Total: 749ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.12 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 1 | mx.web4u.cz (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
Analysis
IP Addresses
petrstyblo.com points to a single IP address: 81.91.86.12.
Other host names such as fotodesign.cz, strechybenesov.cz, erbisystems.cz, braglia.cz and metodo.cz share IPs with petrstyblo.com.
Name Servers
Two name servers ns2.web4u.cz and ns.web4u.cz handle the delegation for petrstyblo.com.
petrstyblo.com shares the same name server setup as other domains, for example lmm.eu, glp.cz, srni.info, parfus.cz and gilmeda.cz.
Host names with two IP numbers:
ns2.web4u.cz points to 2a02:a40:100:28ff::12 and 85.207.53.12.
ns.web4u.cz points to 2001:1568:fd::241 and 185.14.224.241.
Mail Servers
The mx.web4u.cz mail server handles petrstyblo.com.
petrstyblo.com shares the same mail server setup as other domains, including vlscj.cz, hustazmrzlina.eu, jsemzpardubic.cz, kulturne.cz and tiskproradost.cz.
petrstyblo.com shares at least some mail servers with other domains, for instance upgates.sk, ingcorporation.cz and pujcovna-lodi.cz.
mx.web4u.cz points to two IP numbers: 2001:1568::7012 and 81.91.87.12.