`authenticaudio.eu`

DNSSEC	⚠️ Not signed
A	81.91.86.11^{🇨🇿 WEB4U81.91.80.0/21}
		PTR	`php5.web4u.cz`
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	`mx.web4u.cz` ⭐
		A	2001:1568::7012^{🇨🇿 WEB4U2001:1568::/33}
			PTR	`mx.web4u.cz`
		A	81.91.87.12^{🇨🇿 WEB4U81.91.80.0/21}
			PTR	`mx.web4u.cz`
SOA	`ns.web4u.cz`admin@web4u.cz 2011-06-03 #1

`eu`

	DNSSEC	🔒 Signed (DS record present)
	NS	`si.dns.eu` ⭐
	NS	`be.dns.eu`
	NS	`w.dns.eu`
	NS	`x.dns.eu`
	NS	`y.dns.eu`
	SOA	`si.dns.eu`tech@eurid.eu serial=1126898568

Subdomains

mail.authenticaudio.eu

Same first word

authenticaudio.eu

DNS History

5 records (4 active, 1 former)

●NSns.web4u.cz2015-06-04 → 2026-08-09 · 2 obs

● 2015-06-04 18:30:16
● 2026-08-09 05:34:06

●NSns2.web4u.cz2015-06-04 → 2026-08-09 · 2 obs

● 2015-06-04 18:30:16
● 2026-08-09 05:34:06

○MXmail.authenticaudio.eu2015-06-04 → 2018-06-24 · 4 obs

● 2015-06-04 18:30:16
● 2018-06-24 18:41:52
○ 2026-07-01 18:38:58
○ 2026-08-09 05:34:06

●MXmx.web4u.cz2026-07-01 → 2026-08-09 · 3 obs

○ 2018-06-24 18:41:52
● 2026-07-01 18:38:58
● 2026-08-09 05:34:06

●A81.91.86.112015-06-04 → 2026-08-09 · 2 obs

● 2015-06-04 18:30:16
● 2026-08-09 05:34:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
eu	x.dns.eu, si.dns.eu, be.dns.eu, w.dns.eu...	-
authenticaudio.eu	ns2.web4u.cz, ns.web4u.cz	-

✅ Authoritative Response

Server:185.14.224.241

NS records: ns2.web4u.cz, ns.web4u.cz

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for authenticaudio.eu (unsigned zone)

⏱️ Timing

Total: 1189ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.91.86.11`
NS	2	`ns.web4u.cz, ns2.web4u.cz`
MX	1	`mx.web4u.cz (pri: 10)`
SOA	1	`ns.web4u.cz admin.web4u.cz`

Analysis

Hierarchy

authenticaudio.eu is a parent domain of mail.authenticaudio.eu.

IP Addresses

authenticaudio.eu resolves to just one IP address, 81.91.86.11.

Two other host names, along with unishop.cz, faktax.tv and bruco.cz, also share IP numbers with authenticaudio.eu.

Name Servers

authenticaudio.eu is served by two delegated name servers, ns2.web4u.cz and ns.web4u.cz.

authenticaudio.eu shares its NS records with other domains, for example chrastava.eu, photohowto.info, loftware.cz and two others.

Each of the two host names carries two IP addresses: ns2.web4u.cz points to 85.207.53.12 and 2a02:a40:100:28ff::12, and ns.web4u.cz points to 185.14.224.241 and 2001:1568:fd::241.

Mail Servers

The sole mail server for authenticaudio.eu is mx.web4u.cz.

Among the domains sharing a mail server setup with authenticaudio.eu are unicreditgolf.cz, sokordia.eu, clownandbard.cz and two others.

There is at least a partial overlap in mail servers between authenticaudio.eu and other domains like marketo.cz, dentino.cz and smart4smart.cz.

mx.web4u.cz points to two IP addresses: 81.91.87.12 and 2001:1568::7012.

authenticaudio.eu - robtex.com