ob1t.cz - robtex.com
ob1t.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2001:1568::13🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php56.web4u.cz | ||||||
| A | 81.91.86.13🇨🇿 WEB4U81.91.80.0/21 | ||||||
| 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 | mx1.mailchannels.net ⭐ | ||||||
| A | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.us-west-2.compute.amazonaws.com | ||||||
| MX | mx2.mailchannels.net ⭐ | ||||||
| A | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.us-west-2.compute.amazonaws.com | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-03 #0 | ||||||
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=1794251845 | ||||||
Same first word
Similar names
Previous names
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DNS History
6 records (6 active, 0 former)
●MXmx1.mailchannels.net2026-10-07 → 2026-11-09 · 2 obs
● 2026-11-09 19:49:20
●MXmx2.mailchannels.net2026-10-07 → 2026-11-09 · 2 obs
● 2026-11-09 19:49:20
●A2001:1568::132026-10-07 → 2026-11-09 · 2 obs
● 2026-11-09 19:49:20
●A81.91.86.132026-10-07 → 2026-11-09 · 2 obs
● 2026-11-09 19:49:20
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | 8 records |
| ob1t.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: 2220ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.13 |
| AAAA | 1 | 2001:1568::13 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 12
In-bailiwick: 8 (a.ns.nic.cz, a.ns.nic.cz, b.ns.nic.cz...)
Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
IP Addresses
ob1t.cz has two IP addresses: 81.91.86.13 and 2001:1568::13
koupelnoveboxy.eu, mh-computers.cz, immoaporter.com plus two other host names have IP numbers in common with ob1t.cz.
Name Servers
ob1t.cz has two authoritative name servers — ns2.web4u.cz and ns.web4u.cz.
The name server configuration of ob1t.cz is shared with other domains, for instance kravciv-as.cz, afghanembassy.cz, filmingunderwater.eu and two others.
The name servers for ob1t.cz overlap at least partially with those of other domains — for example zivakrajina.cz.
Both ns2.web4u.cz and ns.web4u.cz have two IP addresses each. ns2.web4u.cz resolves to 85.207.53.12 and 2a02:a40:100:28ff::12; ns.web4u.cz resolves to 185.14.224.241 and 2001:1568:fd::241.
Mail Servers
ob1t.cz uses two mail servers, mx1.mailchannels.net and mx2.mailchannels.net.
The mail server setup of ob1t.cz matches that of other domains such as fidealassociates.com, extortion.com, precisionrv.com and two others.
The mail servers for ob1t.cz overlap at least partially with those of other domains, including strom-books.com and stavka-bitcoin.com.
mx1.mailchannels.net and mx2.mailchannels.net each point to one IP address — 54.69.1.140.
The host names mx1.mailchannels.net and mx2.mailchannels.net both resolve to 54.69.1.140 IP addresses.