`zertechleba.cz`

DNSSEC	🔒 Signed (DS record present)
A	178.255.174.238^{🇨🇿 Starnet178.255.168.0/21 s.r.o.}
		PTR	`238.174.255.178.nonstoponline.com`
NS	`ns2.web4u.cz` ⭐
		A	2a02:a40:100:28ff::12^{🇨🇿 BlueTone-AS2a02:a40::/32 Ceske Radiokomunikace, a.s.}
			PTR	`ns2.web4u.cz`
		A	85.207.53.12^{🇨🇿 BlueTone-AS85.207.0.0/16 BlueTone-CRa-CZ Fourth address block}
			PTR	`ns2.web4u.cz`
NS	`ns.web4u.cz`
		A	2001:1568:fd::241^{🇨🇿 WEB4U2001:1568::/33}
			PTR	`ns.web4u.cz`
		A	185.14.224.241^{🇨🇿 WEB4U185.14.224.0/23}
			PTR	`ns.web4u.cz`
MX	`ee0ba2b5d2b1757a.mx1.mojedomena.seznam.cz` ⭐
		A	2a02:598:2::1056^{🇨🇿 SEZNAM-CZ2a02:598:2::/48}
			PTR	`wildcard.mx1.emailprofi.seznam.cz`
		A	77.75.77.56^{🇨🇿 SEZNAM-CZ77.75.76.0/23 SEZNAM - III}
			PTR	`wildcard.mx1.emailprofi.seznam.cz`
MX	`ee0ba2b5d2b1757a.mx2.mojedomena.seznam.cz`⁽¹⁰⁾
		A	2a02:598:2::1146^{🇨🇿 SEZNAM-CZ2a02:598:2::/48}
			PTR	`wildcard.mx2.emailprofi.seznam.cz`
		A	77.75.77.146^{🇨🇿 SEZNAM-CZ77.75.76.0/23 SEZNAM - III}
			PTR	`wildcard.mx2.emailprofi.seznam.cz`
SOA	`ns.web4u.cz`admin@web4u.cz 2026-03-20 #1

`cz`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.ns.nic.cz` ⭐
	NS	`b.ns.nic.cz`
	NS	`c.ns.nic.cz`
	NS	`d.ns.nic.cz`
	SOA	`a.ns.nic.cz`hostmaster@nic.cz serial=1774729036

Same first word

zertechleba.cz

DNS History

7 records (5 active, 2 former)

●NSns.web4u.cz2015-06-18 → 2026-03-28 · 2 obs

● 2015-06-18 05:11:12
● 2026-03-28 20:48:46

●NSns2.web4u.cz2015-06-18 → 2026-03-28 · 2 obs

● 2015-06-18 05:11:12
● 2026-03-28 20:48:46

●MXee0ba2b5d2b1757a.mx1.mojedomena.seznam.cz2026-02-18 → 2026-03-28 · 3 obs

○ 2017-08-27 04:33:48
● 2026-02-18 15:47:12
● 2026-03-28 20:48:46

●MXee0ba2b5d2b1757a.mx2.mojedomena.seznam.cz2026-02-18 → 2026-03-28 · 3 obs

○ 2017-08-27 04:33:48
● 2026-02-18 15:47:12
● 2026-03-28 20:48:46

○MXmail.web4u.cz2016-12-07 → 2017-08-27 · 4 obs

● 2016-12-07 04:54:26
● 2017-08-27 04:33:48
○ 2026-02-18 15:47:12
○ 2026-03-28 20:48:46

●A178.255.174.2382015-06-18 → 2026-03-28 · 6 obs

● 2015-06-18 05:11:12
● 2016-01-17 12:06:42
○ 2016-04-17 14:07:04
○ 2017-08-27 04:33:48
● 2026-02-18 15:47:12
● 2026-03-28 20:48:46

○A37.205.9.2082016-04-17 → 2017-08-27 · 5 obs

○ 2016-01-17 12:06:42
● 2016-04-17 14:07:04
● 2017-08-27 04:33:48
○ 2026-02-18 15:47:12
○ 2026-03-28 20:48:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	b.ns.nic.cz, a.ns.nic.cz, d.ns.nic.cz, c.ns.nic.cz	-
zertechleba.cz	ns.web4u.cz, ns2.web4u.cz	4 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: 687ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`178.255.174.238`
NS	2	`ns.web4u.cz, ns2.web4u.cz`
MX	2	`ee0ba2b5d2b1757a.mx1.mojedomena.seznam.c, ee0ba2b5d2b1757a.mx2.mojedomena.seznam.c`
SOA	1	`ns.web4u.cz admin.web4u.cz`

📌 Glue Records Collected

Total: 4

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

Analysis

IP Addresses

zertechleba.cz points to IP number 178.255.174.238.

Name Servers

zertechleba.cz is delegated to two name servers: ns2.web4u.cz and ns.web4u.cz.

zertechleba.cz uses the same name server setup as other domains such as moraviags.cz, eurofoam-sport.com, labmark.it, designstudiojm.cz and insurance4car.cz.

Host names with two IP numbers:

ns2.web4u.cz points to 2a02:a40:100:28ff::12 and 85.207.53.12; ns.web4u.cz points to 2001:1568:fd::241 and 185.14.224.241.

Mail Servers

Two mail servers ee0ba2b5d2b1757a.mx1.mojedomena.seznam.cz and ee0ba2b5d2b1757a.mx2.mojedomena.seznam.cz handle zertechleba.cz.