mail.penicka.cz - robtex.com

mail.penicka.cz

DNSSEC⚠️ Not signed
A81.91.87.10🇨🇿 WEB4U81.91.80.0/21
PTRmail.web4u.cz

penicka.cz

DNSSEC🔒 Signed (DS record present)
A2001:1568::12🇨🇿 WEB4U2001:1568::/33
A2001:1568::14🇨🇿 WEB4U2001:1568::/33
A81.91.86.12🇨🇿 WEB4U81.91.80.0/21
A81.91.86.14🇨🇿 WEB4U81.91.80.0/21
NSns2.web4u.cz ⭐
NSns.web4u.cz
MXmx1.mailchannels.net ⭐
MXmx2.mailchannels.net ⭐
TXTv=spf1 a:rs31.web4u.cz a:www-relay.web4u.cz ip4:81.91.86.9 ip4:10.1.0.0/16 ip...
SOAns.web4u.czadmin@web4u.cz 2025-05-04 #0

Previously MX for

penicka.cz

Same first word

mail.rec.br
mail.com.ps
mail.(0x6c6f6c697461)punk.jp
mail.sc
mail.gov.ie
mail.company
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DNS History

1 record (1 active, 0 former)

20162017201820192020202120222023202420252026A81.91.87.10
●A81.91.87.102015-07-09 → 2026-04-24 · 2 obs
● 2015-07-09 14:12:50
● 2026-04-24 14:15:54

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz-
penicka.czns.web4u.cz, ns2.web4u.cz4 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: 973ms | Queries: -

📄 Records

TypeCountSample Data
A181.91.87.10

📌 Glue Records Collected

Total: 4

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

Analysis

IP Addresses

mail.penicka.cz points to IP number 81.91.87.10.

For instance, other host names mail.zsbrok.cz, mail.isosklo.cz, pop.jgolem.cz, mail.tosaz.cz and mail.automotofans.cz share IP numbers with mail.penicka.cz.