`abc-construction.cz`

DNSSEC	⚠️ Not signed
A	194.228.50.10^{🇨🇿 O2-CZECH-REPUBLIC194.228.0.0/17 CZ.CZNET}
		PTR	`mx.don.cz`
NS	`ns2.don.cz` ⭐
		A	194.228.50.11^{🇨🇿 O2-CZECH-REPUBLIC194.228.0.0/17 CZ.CZNET}
			PTR	`mx2.don.cz`
NS	`ns.don.cz`
		A	194.228.50.10^{🇨🇿 O2-CZECH-REPUBLIC194.228.0.0/17 CZ.CZNET}
			PTR	`mx.don.cz`
MX	`mx.don.cz` ⭐
		A	194.228.50.10^{🇨🇿 O2-CZECH-REPUBLIC194.228.0.0/17 CZ.CZNET}
			PTR	`mx.don.cz`
TXT	`v=spf1 +a +mx +ip4:194.228.50.10 +ip4:194.228.50.11 ~all`
SOA	`ns.don.cz`hostmaster@don.cz serial=1784634321

`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=1785734242

Same first word

abc-construction.net

abc-construction.de

abc-construction.cz

Similar names

acb-construction.fr

DNS History

4 records (4 active, 0 former)

●NSns.don.cz2015-08-07 → 2026-08-03 · 2 obs

● 2015-08-07 02:17:58
● 2026-08-03 05:40:32

●NSns2.don.cz2015-08-07 → 2026-08-03 · 2 obs

● 2015-08-07 02:17:58
● 2026-08-03 05:40:32

●MXmx.don.cz2015-08-07 → 2026-08-03 · 2 obs

● 2015-08-07 02:17:58
● 2026-08-03 05:40:32

●A194.228.50.102015-08-07 → 2026-08-03 · 2 obs

● 2015-08-07 02:17:58
● 2026-08-03 05:40:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
abc-construction.cz	ns.don.cz, ns2.don.cz	2 records

✅ Authoritative Response

Server:194.228.50.11

NS records: ns.don.cz, ns2.don.cz

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for abc-construction.cz (unsigned zone)

⏱️ Timing

Total: 772ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`194.228.50.10`
NS	2	`ns.don.cz, ns2.don.cz`
MX	1	`mx.don.cz (pri: 0)`
TXT	1	`v=spf1 +a +mx +ip4:194.228.50.10 +ip4:19`
SOA	1	`ns.don.cz hostmaster.don.cz`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.don.cz, ns2.don.cz)

Analysis

IP Addresses

abc-construction.cz has exactly one IP address — 194.228.50.10.

prochazkova.com, ns.don.cz, lmreality.cz plus two other host names have IP numbers in common with abc-construction.cz.

Name Servers

abc-construction.cz uses two name servers for its delegation: ns2.don.cz and ns.don.cz.

The name server configuration of abc-construction.cz is shared with other domains, for instance lmreality.cz, aikibudo.cz, rar-reality.cz and two others.

ns2.don.cz → 194.228.50.11 and ns.don.cz → 194.228.50.10: one IP number per host name.

Mail Servers

abc-construction.cz uses one mail server — mx.don.cz.

The mail server setup of abc-construction.cz matches that of other domains such as aikibudo.eu, ssl.don.cz, dfklub.cz and two others.

abc-construction.cz and other domains — don.cz for instance — share at least some mail servers.

These mail servers tend to be used in conjunction with the mail servers mx2.don.cz.

mx.don.cz directs to just one IP number, 194.228.50.10.

abc-construction.cz - robtex.com