`mx-02.jestedliberec.cz`

DNSSEC	⚠️ Not signed
A	2a01:28:ca:72::100:233^{🇨🇿 SuperNetwork2a01:28::/32 s.r.o.}
		PTR	`mx-02.as4u.org`
A	88.86.100.233^{🇨🇿 SuperNetwork88.86.96.0/19 s.r.o.}

`jestedliberec.cz`

	DNSSEC	⚠️ Not signed
	A	2a01:28:ca:72::100:195^{🇨🇿 SuperNetwork2a01:28::/32 s.r.o.}
	A	88.86.100.195^{🇨🇿 SuperNetwork88.86.96.0/19 s.r.o.}
	NS	`ns.as4u.org` ⭐
	NS	`ns.as4u.cz`
	NS	`ns.district9.cz`
	MX	`mx-01.jestedliberec.cz` ⭐
	MX	`mx-02.jestedliberec.cz`⁽¹⁰⁾
	SOA	`ns.as4u.org`hostmaster@as4u.org 2018-08-24 #0

MX for

jestedliberec.cz

Same first word

mx-02.de

Similar names

mx-20.com

DNS History

2 records (2 active, 0 former)

●A2a01:28:ca:72::100:2332018-06-11 → 2026-04-26 · 5 obs

● 2018-06-11 16:00:12
● 2026-04-04 21:51:16
○ 2026-04-10 09:36:16
● 2026-04-20 22:08:24
● 2026-04-26 01:04:52

●A88.86.100.2332018-06-11 → 2026-04-26 · 5 obs

● 2018-06-11 16:00:12
● 2026-04-04 21:51:16
○ 2026-04-10 09:36:16
● 2026-04-20 22:08:24
● 2026-04-26 01:04:52

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	8 records
jestedliberec.cz	ns.as4u.cz, ns.as4u.org, ns.district9.cz	2 records

✅ Authoritative Response

Server:88.86.100.200

NS records: ns.as4u.cz, ns.as4u.org, ns.district9.cz

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for jestedliberec.cz (unsigned zone)

⏱️ Timing

Total: 4470ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`88.86.100.233`
AAAA	1	`2a01:28:ca:72::100:233`

📌 Glue Records Collected

Total: 10

In-bailiwick: 8 (a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz...)

Out-of-bailiwick: 2 (ns.as4u.cz, ns.as4u.cz)

Analysis

Mail Server Role

mx-02.jestedliberec.cz serves as the mail server for jestedliberec.cz.

mx-01.jestedliberec.cz serves as a mail server, commonly paired with mx-02.jestedliberec.cz.

IP Addresses

mx-02.jestedliberec.cz resolves to two IP numbers: 2a01:28:ca:72::100:233 and 88.86.100.233.

Other host names, for instance mx-02.plzensky-kraj.com, mx-02.kraslicko.cz, mx-02.r-incon.com, mx-02.mpprerov.cz and mx-02.slivovice.eu share IP numbers with mx-02.jestedliberec.cz.

mx-02.jestedliberec.cz - robtex.com