`itmasters.cz`

DNSSEC	🔒 Signed (DS record present)
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`
SOA	`ns.web4u.cz`admin@web4u.cz 2025-01-11 #4

`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=1774840636

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DNS History

4 records (2 active, 2 former)

●NSns.web4u.cz2015-07-05 → 2026-03-30 · 2 obs

● 2015-07-05 16:10:40
● 2026-03-30 03:45:26

●NSns2.web4u.cz2015-07-05 → 2026-03-30 · 2 obs

● 2015-07-05 16:10:40
● 2026-03-30 03:45:26

○MXmail.itmasters.cz2015-07-05 → 2020-01-06 · 4 obs

● 2015-07-05 16:10:40
● 2020-01-06 20:46:24
○ 2026-03-26 08:16:26
○ 2026-03-30 03:45:26

○A81.91.83.1182015-07-05 → 2020-01-06 · 4 obs

● 2015-07-05 16:10:40
● 2020-01-06 20:46:24
○ 2026-03-26 08:16:26
○ 2026-03-30 03:45:26

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, d.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz	-
itmasters.cz	ns.web4u.cz, ns2.web4u.cz	4 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: 1062ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`ns.web4u.cz, ns2.web4u.cz`
SOA	1	`ns.web4u.cz admin.web4u.cz`

📌 Glue Records Collected

Total: 4

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

Analysis

Name Servers

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

itmasters.cz uses the same name server setup as other domains such as hunt.cz, rh-arch.com, 4allpro.cz, brdy.info and keepsmileklinika.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.

itmasters.cz - robtex.com

itmasters.cz

cz