mail.b2comp.cz - robtex.com

mail.b2comp.cz

DNSSEC⚠️ Not signed
A2001:1568:f::1154🇨🇿 WEB4U2001:1568::/33
PTRvs1154.server4u.cz
A81.91.92.182🇨🇿 WEB4U81.91.88.0/21

b2comp.cz

DNSSEC🔒 Signed (DS record present)
A85.160.64.77🇨🇿 O2-CZECH-REPUBLIC85.160.0.0/15 CZ.CZNET
NSns2.web4u.cz ⭐
NSns.web4u.cz
MXmail.b2comp.cz ⭐
TXTv=spf1 mx -all
TXTMS=310AD85E504A2E95D2E2EFDCF692FF92DC4B9F64
SOAns.web4u.czadmin@web4u.cz 2025-06-11 #0

MX for

b2comp.cz

Same first word

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DNS History

3 records (2 active, 1 former)

20162017201820192020202120222023202420252026A2001:1568:f::115481.91.92.18281.91.82.208
●A2001:1568:f::11542026-03-13 → 2026-03-27 · 3 obs
○ 2016-06-22 19:26:54
● 2026-03-13 13:09:20
● 2026-03-27 04:53:12
○A81.91.82.2082015-08-14 → 2016-01-28 · 4 obs
● 2015-08-14 01:20:26
● 2016-01-28 19:29:30
○ 2016-06-22 19:26:54
○ 2026-03-27 04:53:12
●A81.91.92.1822016-06-22 → 2026-03-27 · 3 obs
○ 2016-01-28 19:29:30
● 2016-06-22 19:26:54
● 2026-03-27 04:53:12

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
czc.ns.nic.cz, b.ns.nic.cz, a.ns.nic.cz, d.ns.nic.cz-
b2comp.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: 575ms | Queries: -

📄 Records

TypeCountSample Data
A181.91.92.182
AAAA12001:1568:f::1154

📌 Glue Records Collected

Total: 4

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

Analysis

Mail Server Role

mail.b2comp.cz serves as the mail server for b2comp.cz.

IP Addresses

mail.b2comp.cz resolves to two IP numbers: 2001:1568:f::1154 and 81.91.92.182.

Other host names, for instance studanka.info, mail.humanita.cz, rybnikar.org, mail.brtnice.org and mail.dezeta.cz share IP numbers with mail.b2comp.cz.