mail.exttra.cz - robtex.com

mail.exttra.cz

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

exttra.cz

DNSSEC⚠️ Not signed
A81.91.86.12🇨🇿 WEB4U81.91.80.0/21
NSns2.web4u.cz ⭐
NSns.web4u.cz
MXmx.web4u.cz ⭐
SOAns.web4u.czadmin@web4u.cz 2012-12-04 #1

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DNS History

1 record (1 active, 0 former)

20162017201820192020202120222023202420252026A81.91.87.10
●A81.91.87.102015-05-21 → 2026-05-11 · 2 obs
● 2015-05-21 21:09:46
● 2026-05-11 22:25:08

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz-
exttra.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: 1202ms | 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.exttra.cz points to a single IP: 81.91.87.10.

Other host names, for instance mail.lokoc.eu, mail.metaltrue.com, mail.sedmak.cz, mail.driedflowers.eu and mail.ksatek.cz share IP numbers with mail.exttra.cz.