kerbl.cz - robtex.com
kerbl.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2001:1568::14🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php7.web4u.cz | ||||||
| A | 81.91.86.14🇨🇿 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 | 54.187.177.89🇺🇸 Amazon54.186.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-54-187-177-89.us-west-2.compute.amazonaws.com | ||||||
| MX | mx2.mailchannels.net ⭐ | ||||||
| A | 54.187.177.89🇺🇸 Amazon54.186.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-54-187-177-89.us-west-2.compute.amazonaws.com | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-05 #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=1785530841 | ||||||
Same first word
kerbl.de |
kerbl.eu |
kerbl.sk |
kerbl.pl |
kerbl.no |
kerbl.farm |
kerbl.cz |
kerbl.info |
kerbl.fr |
kerbl.gmbh |
kerbl.at |
kerbl.co.at |
kerbl.ro |
kerbl.com |
kerbl.nl |
kerbl.net |
kerbl.ru |
Similar names
krelb.com |
blerk.com |
belrk.ru |
klebr.com |
lkerb.com |
blerk.info |
brlek.com |
berlk.com |
bekrl.com |
brekl.ru |
blerk.us |
blker.com |
blerk.org |
blkre.com |
berkl.ee |
rbelk.org |
klbre.com |
rbelk.com |
brelk.com |
DNS History
13 records (6 active, 7 former)
○NSalfa.ns.active24.cz2015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
○NSbeta.ns.active24.cz2015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
○NSgama.ns.active24.sk2015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
●NSns.web4u.cz2026-06-13 → 2026-07-31 · 3 obs
● 2026-06-13 00:19:32
● 2026-07-31 21:11:10
●NSns2.web4u.cz2026-06-13 → 2026-07-31 · 3 obs
● 2026-06-13 00:19:32
● 2026-07-31 21:11:10
○MXin.smtp.cz2015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
○MXmx.smtp.cz2015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
●MXmx1.mailchannels.net2026-06-13 → 2026-07-31 · 3 obs
● 2026-06-13 00:19:32
● 2026-07-31 21:11:10
●MXmx2.mailchannels.net2026-06-13 → 2026-07-31 · 3 obs
● 2026-06-13 00:19:32
● 2026-07-31 21:11:10
●A2001:1568::142026-06-13 → 2026-07-31 · 3 obs
● 2026-06-13 00:19:32
● 2026-07-31 21:11:10
○A2a02:4a8:ac24:108::96:2112015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
●A81.91.86.142026-06-13 → 2026-07-31 · 3 obs
● 2026-06-13 00:19:32
● 2026-07-31 21:11:10
○A81.95.96.2112015-07-14 → 2015-11-11 · 4 obs
● 2015-11-11 23:25:24
○ 2016-02-03 17:56:16
○ 2026-07-31 21:11:10
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | - |
| kerbl.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: 869ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.14 |
| AAAA | 1 | 2001:1568::14 |
| 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: 4
Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
IP Addresses
kerbl.cz directs to two IP numbers, 81.91.86.14 and 2001:1568::14
atto.cz, aliance.cz, www.udk.cz plus two other host names have IP numbers in common with kerbl.cz.
Name Servers
DNS delegation for kerbl.cz points to two name servers: ns2.web4u.cz and ns.web4u.cz.
The name server configuration of kerbl.cz is shared with other domains, for instance okfotodk.cz, xn--hojenran-g2a.eu, tichanek.cz and two others.
ns2.web4u.cz directs to 85.207.53.12 and 2a02:a40:100:28ff::12. ns.web4u.cz directs to 185.14.224.241 and 2001:1568:fd::241. Each host name carries two IP addresses.
Mail Servers
kerbl.cz uses two mail servers, mx1.mailchannels.net and mx2.mailchannels.net.
The mail server setup of kerbl.cz matches that of other domains such as webrichsoftware.com, medvt.de, filminthefridge.com and two others.
kerbl.cz has mail servers in common with other domains — for example icebreakers.se and aguasdosaofrancisco.com.br.
Both mx1.mailchannels.net and mx2.mailchannels.net have a single IP address, 54.187.177.89, and share it.
Host names pointing to 54.187.177.89 IP addresses: mx1.mailchannels.net and mx2.mailchannels.net.