`advantech-vpn.com`

DNSSEC	⚠️ Not signed
A	2001:1568::14^{🇨🇿 WEB4U2001:1568::/33}
		PTR	`php7.web4u.cz`
A	81.91.86.14^{🇨🇿 WEB4U81.91.80.0/21}
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 2020-07-28 #1

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1775973887

Same first word

advantech-vpn.com

DNS History

5 records (5 active, 0 former)

●NSns.web4u.cz2026-04-01 → 2026-04-12 · 2 obs

● 2026-04-01 00:24:54
● 2026-04-12 06:23:22

●NSns2.web4u.cz2026-04-01 → 2026-04-12 · 2 obs

● 2026-04-01 00:24:54
● 2026-04-12 06:23:22

●MXmx.web4u.cz2026-04-01 → 2026-04-12 · 2 obs

● 2026-04-01 00:24:54
● 2026-04-12 06:23:22

●A2001:1568::142026-04-01 → 2026-04-12 · 2 obs

● 2026-04-01 00:24:54
● 2026-04-12 06:23:22

●A81.91.86.142026-04-01 → 2026-04-12 · 2 obs

● 2026-04-01 00:24:54
● 2026-04-12 06:23:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	i.gtld-servers.net, e.gtld-servers.net, g.gtld-servers.net, a.gtld-servers.net...	-
advantech-vpn.com	ns.web4u.cz, ns2.web4u.cz	-

✅ Authoritative Response

Server:185.14.224.241

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for advantech-vpn.com (unsigned zone)

⏱️ Timing

Total: 447ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.91.86.14`
AAAA	1	`2001:1568::14`
NS	2	`ns.web4u.cz, ns2.web4u.cz`
MX	1	`mx.web4u.cz (pri: 10)`
SOA	1	`ns.web4u.cz admin.web4u.cz`

Analysis

IP Addresses

advantech-vpn.com resolves to two IP numbers: 2001:1568::14 and 81.91.86.14.

Other host names, for instance vs950-gw.server4u.cz, stopkovaplzenskapivnice.cz, nadobrounoc.cz, navon.se and vs227.server4u.cz share IP numbers with advantech-vpn.com.

Name Servers

Two name servers ns2.web4u.cz and ns.web4u.cz handle delegation for advantech-vpn.com.

advantech-vpn.com uses the same name server setup as other domains, for example kolonialbrno.cz, trapp.cz, noemarch.cz, barvirhracky.cz and exekuceliberec.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

advantech-vpn.com is handled by a single mail server, mx.web4u.cz.

advantech-vpn.com has the same mail server setup as other domains, including cesky-raj.com, hejtmanek.cz, conslane.com, jakubvana.cz and hellair.org.

advantech-vpn.com shares some mail servers with other domains, at least partially, such as marketo.cz, dentino.cz, smart4smart.cz, basic-numbers.com and denisaadolfova.com.

These mail servers are often used together with mx1.mailchannels.net and mx2.mailchannels.net.

Host mx.web4u.cz resolves to two IPs: 2001:1568::7012 and 81.91.87.12.

advantech-vpn.com - robtex.com