ceskasrdce.cz - robtex.com
ceskasrdce.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 | 54.69.1.140🇺🇸 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 2025-05-09 #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=1777139236 | ||||||
Same first word
ceskasrdce.cz |
DNS History
13 records (6 active, 7 former)
●NSns.web4u.cz2020-03-23 → 2026-04-25 · 3 obs
● 2020-03-23 19:07:44
● 2026-04-25 18:12:36
○NSns1.regzone.cz2015-07-20 → 2016-03-17 · 4 obs
● 2016-03-17 00:15:30
○ 2016-07-15 01:09:14
○ 2026-04-25 18:12:36
○NSns1.regzone.de2015-07-20 → 2016-03-17 · 4 obs
● 2016-03-17 00:15:30
○ 2016-07-15 01:09:14
○ 2026-04-25 18:12:36
○NSns1.regzone.info2015-07-20 → 2016-03-17 · 4 obs
● 2016-03-17 00:15:30
○ 2016-07-15 01:09:14
○ 2026-04-25 18:12:36
●NSns2.web4u.cz2020-03-23 → 2026-04-25 · 3 obs
● 2020-03-23 19:07:44
● 2026-04-25 18:12:36
○MXmail.draconus.cz2020-03-23 → 2020-03-23 · 2 obs
○ 2026-04-25 18:12:36
●MXmx1.mailchannels.net2026-04-25 → 2026-04-25 · 2 obs
● 2026-04-25 18:12:36
●MXmx2.mailchannels.net2026-04-25 → 2026-04-25 · 2 obs
● 2026-04-25 18:12:36
●A2001:1568::142026-04-25 → 2026-04-25 · 2 obs
● 2026-04-25 18:12:36
○A217.198.116.1882015-07-20 → 2016-03-17 · 4 obs
● 2016-03-17 00:15:30
○ 2016-07-15 01:09:14
○ 2026-04-25 18:12:36
○A2a01:430:17:1::ffff:14832020-03-23 → 2020-03-23 · 3 obs
● 2020-03-23 19:07:44
○ 2026-04-25 18:12:36
○A37.205.12.362020-03-23 → 2020-03-23 · 3 obs
● 2020-03-23 19:07:44
○ 2026-04-25 18:12:36
●A81.91.86.142026-04-25 → 2026-04-25 · 2 obs
● 2026-04-25 18:12:36
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | - |
| ceskasrdce.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: 1048ms | 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
ceskasrdce.cz resolves to two IP numbers: 2001:1568::14 and 81.91.86.14.
other host names including caffee2go.com, imaginelux.com, napoleongrily.cz, d317.server4u.cz and ns2.wavenet.cz share IP numbers with ceskasrdce.cz.
Name Servers
ceskasrdce.cz is delegated to two name servers ns2.web4u.cz and ns.web4u.cz.
ceskasrdce.cz shares the same name server setup as other domains, for instance vylecim.cz, contacto-drinks.com, best-residence.com, abram.cz and narex.ch.
Host names with two IP numbers:
The host name ns2.web4u.cz points to 2a02:a40:100:28ff::12 and 85.207.53.12; the host name ns.web4u.cz points to 2001:1568:fd::241 and 185.14.224.241.
Mail Servers
Two mail servers handle ceskasrdce.cz: mx1.mailchannels.net and mx2.mailchannels.net.
ceskasrdce.cz shares the same mail server setup as other domains, for instance stlydias.org, jstuelitesllc.com, valleverde.net.ve, mail.glitterbook.com and sparkpixel.co.uk.
ceskasrdce.cz shares mail servers with other domains to some extent, for instance erstadviken.se.
Host names with one IP number:
mx1.mailchannels.net points to 54.187.177.89
mx2.mailchannels.net points to 54.69.1.140