mail.dn.cz - robtex.com

mail.dn.cz

DNSSEC⚠️ Not signed
A2001:1568::14🇨🇿 WEB4U2001:1568::/33
PTRphp7.web4u.cz
A81.91.86.14🇨🇿 WEB4U81.91.80.0/21

dn.cz

DNSSEC🔒 Signed (DS record present)
A2001:1568::14🇨🇿 WEB4U2001:1568::/33
A81.91.86.14🇨🇿 WEB4U81.91.80.0/21
NSns2.web4u.cz ⭐
NSns.web4u.cz
MXmx1.mailchannels.net ⭐
MXmx2.mailchannels.net ⭐
SOAns.web4u.czadmin@web4u.cz 2025-05-04 #0

Previously MX for

dn.cz

Same first word

mail.guide
mail.chips.jp
mail.info
mail.simplesite.com
mail.gw
mail.tv
mail.jellybean.jp
mail.eg
mail.chu.jp
mail.gouv.sn
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mail.myjino.ru
mail.space
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mail.read-books.org
mail.ilovecollege.info
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mail.ma
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mail.hashbang.sh
mail.mil.ru
mail.schwarz
mail.co.uk
mail.net.mk
mail.rj.gov.br
mail.freedesktop.org
mail.direct
mail.yandex
mail.sh.cn
mail.vacations
mail.my

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lima.sk
ilma.at
amil.com
ilma.org.in
amil.eu
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imal.biz
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DNS History

4 records (2 active, 2 former)

2017201820192020202120222023202420252026A2001:1568::1481.91.86.1481.91.87.10CNAMEkuky.core.ignum.cz
●A2001:1568::142026-02-15 → 2026-04-27 · 3 obs
○ 2021-09-21 14:10:46
● 2026-02-15 01:58:14
● 2026-04-27 21:05:48
●A81.91.86.142026-02-15 → 2026-04-27 · 3 obs
○ 2021-09-21 14:10:46
● 2026-02-15 01:58:14
● 2026-04-27 21:05:48
○A81.91.87.102016-06-22 → 2021-09-21 · 4 obs
● 2016-06-22 09:35:32
● 2021-09-21 14:10:46
○ 2026-02-15 01:58:14
○ 2026-04-27 21:05:48
○CNAMEkuky.core.ignum.cz2016-06-22 → 2016-06-22 · 3 obs
● 2016-06-22 09:35:32
○ 2016-11-29 14:54:30
○ 2026-04-27 21:05:48

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz-
dn.czns.web4u.cz, ns2.web4u.cz4 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: 1128ms | Queries: -

📄 Records

TypeCountSample Data
A181.91.86.14
AAAA12001:1568::14

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)

Analysis

IP Addresses

mail.dn.cz resolves to two IP numbers: 2001:1568::14 and 81.91.86.14.

other host names including online4u.sk, www.cachel.cz, storyfox.cz, mail.svetorisku.cz and www.bulovkabc.cz share IP numbers with mail.dn.cz.