physiostudy.com - robtex.com
physiostudy.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 2012-04-27 #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=1778627796 | ||||||
Subdomains
mail.physiostudy.com |
Same first word
physiostudy.com |
DNS History
5 records (4 active, 1 former)
○MXmail.physiostudy.com2015-08-14 → 2017-04-02 · 4 obs
● 2017-04-02 02:04:52
○ 2026-04-19 07:11:10
○ 2026-05-12 23:42:48
●MXmx.web4u.cz2026-04-19 → 2026-05-12 · 3 obs
● 2026-04-19 07:11:10
● 2026-05-12 23:42:48
●A81.91.86.122015-08-14 → 2026-05-12 · 2 obs
● 2026-05-12 23:42:48
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| physiostudy.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 physiostudy.com (unsigned zone)
⏱️ Timing
Total: 1687ms | 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
Hierarchy
The parent of mail.physiostudy.com is physiostudy.com.
IP Addresses
physiostudy.com points to an IP address: 81.91.86.12.
other host names include naradidewalt.cz, 4ipc.eu, zakarta.com, heliman.eu and pejcha.cz; they share IP numbers with physiostudy.com.
Name Servers
Two name servers ns2.web4u.cz and ns.web4u.cz handle the delegation for physiostudy.com.
physiostudy.com shares the same name server setup as other domains, for instance velosport.cz, skala-servis.cz, lamur.cz, petrhromada.cz and ffy.cz.
physiostudy.com at least partially shares name servers with other domains, including gasstorage.cz and voss-ova.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
physiostudy.com is handled by a single mail server, mx.web4u.cz.
physiostudy.com uses the same mail server setup as other domains, for instance letmo.net, actsafe.cz, parthenaise.cz, hunt.cz and zakarta.mobi.
mx.web4u.cz resolves to two IPs: 2001:1568::7012 and 81.91.87.12.