isosklo.com - robtex.com
isosklo.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 2014-09-17 #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=1785583607 | ||||||
Subdomains
mail.isosklo.com |
Same first word
Similar names
DNS History
5 records (4 active, 1 former)
○MXmail.isosklo.com2016-12-17 → 2017-10-12 · 4 obs
● 2017-10-12 18:01:16
○ 2026-06-27 01:02:06
○ 2026-08-01 11:27:58
●MXmx.web4u.cz2026-06-27 → 2026-08-01 · 3 obs
● 2026-06-27 01:02:06
● 2026-08-01 11:27:58
●A81.91.86.122016-12-17 → 2026-08-01 · 2 obs
● 2026-08-01 11:27:58
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| isosklo.com | ns.web4u.cz, ns2.web4u.cz | - |
✅ Authoritative Response
Server:85.207.53.12
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for isosklo.com (unsigned zone)
⏱️ Timing
Total: 714ms | 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
mail.isosklo.com is a subdomain of isosklo.com.
IP Addresses
isosklo.com has exactly one IP address — 81.91.86.12.
tvtipsport.eu, mt-pharma.cz, www.bystrc.com plus two other host names have IP numbers in common with isosklo.com.
Name Servers
isosklo.com uses two name servers for its delegation: ns2.web4u.cz and ns.web4u.cz.
The name server configuration of isosklo.com is shared with other domains, for instance mistoler.cz, ateq.sk, sukal.cz and two others.
The two host names ns2.web4u.cz and ns.web4u.cz each have a pair of IP addresses: ns2.web4u.cz has 85.207.53.12 and 2a02:a40:100:28ff::12, and ns.web4u.cz has 185.14.224.241 and 2001:1568:fd::241.
Mail Servers
isosklo.com uses one mail server — mx.web4u.cz.
The mail server setup of isosklo.com matches that of other domains such as montyjawa.cz, irx.cz, plyspo.com and two others.
At least some of the mail servers used by isosklo.com are shared with other domains: cejkaholding.cz, upgates.sk, ingcorporation.cz and two others among them.
These mail servers are often deployed together with mx2.web4u.cz, mail.cejkaholding.cz, mx1.web4u.cz and 4 other mail servers.
mx.web4u.cz resolves to two IP numbers — 81.91.87.12 and 2001:1568::7012.