brzek.cz - robtex.com
brzek.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| 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 | mx1.mailchannels.net ⭐ | ||||||
| A | 18.236.29.166🇺🇸 Amazon18.236.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-18-236-29-166.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 | ||||||
| TXT | v=spf1 include:_spf.web4u.cz include:somt.cz ~all | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-04 #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=1774669634 | ||||||
Subdomains
www.brzek.cz |
Same first word
Similar names
brekz.at |
bzerk.org |
brekz.net |
brekz.nl |
brekz.com |
bzerk.net |
kbrez.de |
brekz.eu |
brekz.de |
bezkr.es |
kzbre.cc |
krbez.at |
brekz.fr |
brekz.be |
bzker.cn |
brekz.it |
bezrk.sk |
bezrk.ru |
DNS History
7 records (5 active, 2 former)
○MXmail.brzek.cz2015-08-19 → 2017-03-16 · 4 obs
● 2017-03-16 06:17:18
○ 2021-11-11 18:43:30
○ 2026-03-28 04:14:04
○MXmx.web4u.cz2021-11-11 → 2021-11-11 · 4 obs
● 2021-11-11 18:43:30
○ 2026-03-25 22:33:58
○ 2026-03-28 04:14:04
●MXmx1.mailchannels.net2026-03-25 → 2026-03-28 · 3 obs
● 2026-03-25 22:33:58
● 2026-03-28 04:14:04
●MXmx2.mailchannels.net2026-03-25 → 2026-03-28 · 3 obs
● 2026-03-25 22:33:58
● 2026-03-28 04:14:04
●A81.91.86.122015-08-19 → 2026-03-28 · 2 obs
● 2026-03-28 04:14:04
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| brzek.cz | ns.web4u.cz, ns2.web4u.cz | 4 records |
✅ Authoritative Response
Server:85.207.53.12
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1107ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.12 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| TXT | 1 | v=spf1 include:_spf.web4u.cz include:som |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
Hierarchy
brzek.cz is the parent of www.brzek.cz.
IP Addresses
brzek.cz points to a single IP number: 81.91.86.12.
other host names for instance musicaviva.cz, mirisys.com, vyklizeni-bytu-praha.cz, petrstyblo.com and pipec.cz share IP numbers with brzek.cz.
Name Servers
brzek.cz is delegated to two name servers: ns2.web4u.cz and ns.web4u.cz.
brzek.cz shares the same name server setup as other domains, for example vastarredo.cz, ordinace-bubenec.cz, milpe.cz, whitebox.cz and supervisor.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
brzek.cz is handled by two mail servers: mx1.mailchannels.net and mx2.mailchannels.net.
brzek.cz shares the same mail server setup as other domains, for instance birdofparadisepress.org, chrystene.com, mail.intlmag.org, sonja.coffee and nadeau.com.
brzek.cz shares some mail servers with other domains at least partially, for example actknowledge.org.
Host names with one IP number:
The host mx1.mailchannels.net points to 18.236.29.166 and the host mx2.mailchannels.net points to 54.69.1.140.