mail.contek.cz - robtex.com

mail.contek.cz

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

contek.cz

DNSSEC⚠️ Not signed
A81.91.86.10🇨🇿 WEB4U81.91.80.0/21
NSns2.web4u.cz ⭐
NSns.web4u.cz
MXmx1.mailchannels.net ⭐
MXmx2.mailchannels.net ⭐
TXTv=spf1 include:_spf.web4u.cz ~all
SOAns.web4u.czadmin@web4u.cz 2025-04-30 #0

Previously MX for

contek.cz

Same first word

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DNS History

1 record (1 active, 0 former)

20162017201820192020202120222023202420252026A81.91.87.10
●A81.91.87.102015-07-23 → 2026-07-08 · 2 obs
● 2015-07-23 22:14:02
● 2026-07-08 02:18:02

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz-
contek.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: 2110ms | Queries: -

📄 Records

TypeCountSample Data
A181.91.87.10

📌 Glue Records Collected

Total: 4

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

Analysis

IP Addresses

mail.contek.cz resolves to just one IP address, 81.91.87.10.

Two other host names, along with mail.serlich.cz, mail.apocalypse.cz and mail.petrvytiska.com, also share IP numbers with mail.contek.cz.