`helpforexpats.cz`

DNSSEC	🔒 Signed (DS record present)
A	81.91.86.12^{🇨🇿 WEB4U81.91.80.0/21}
		PTR	`php53.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	`mx1.mailchannels.net` ⭐
		A	18.236.29.166^{🇺🇸 Amazon18.236.0.0/15 EC2 PDX prefix}
			PTR	`ec2-18-236-29-166.us-west-2.compute.amazonaws.com`
MX	`mx2.mailchannels.net` ⭐
		A	54.69.1.140^{🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix}
			PTR	`ec2-54-69-1-140.us-west-2.compute.amazonaws.com`
SOA	`ns.web4u.cz`admin@web4u.cz 2025-05-03 #0

`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=1776082634

Same first word

helpforexpats.cz

DNS History

6 records (5 active, 1 former)

●NSns.web4u.cz2015-08-14 → 2026-04-13 · 2 obs

● 2015-08-14 17:23:08
● 2026-04-13 12:55:06

●NSns2.web4u.cz2015-08-14 → 2026-04-13 · 2 obs

● 2015-08-14 17:23:08
● 2026-04-13 12:55:06

○MXmail.helpforexpats.cz2015-08-14 → 2017-05-15 · 4 obs

● 2015-08-14 17:23:08
● 2017-05-15 12:55:44
○ 2026-02-20 05:10:20
○ 2026-04-13 12:55:06

●MXmx1.mailchannels.net2026-02-20 → 2026-04-13 · 3 obs

○ 2017-05-15 12:55:44
● 2026-02-20 05:10:20
● 2026-04-13 12:55:06

●MXmx2.mailchannels.net2026-02-20 → 2026-04-13 · 3 obs

○ 2017-05-15 12:55:44
● 2026-02-20 05:10:20
● 2026-04-13 12:55:06

●A81.91.86.122015-08-14 → 2026-04-13 · 2 obs

● 2015-08-14 17:23:08
● 2026-04-13 12:55:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
helpforexpats.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: 906ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.91.86.12`
NS	2	`ns.web4u.cz, ns2.web4u.cz`
MX	2	`mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10)`
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

IP Addresses

helpforexpats.cz points to a single IP: 81.91.86.12.

Other host names, for instance globalred.ch, veciuredni.cz, hilgert.ch, www.radekvolf.com and businessparkradotin.cz share IP numbers with helpforexpats.cz.

Name Servers

Two name servers ns2.web4u.cz and ns.web4u.cz handle delegation for helpforexpats.cz.

helpforexpats.cz uses the same name server setup as other domains, for example infomatic.cz, roxanastodolni.cz, dpdesign.eu, pointshop.cz and hospodaucerta.cz.

helpforexpats.cz shares name servers with other domains at least in part, for instance varicad.eu.

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

helpforexpats.cz is handled by two mail servers: mx1.mailchannels.net and mx2.mailchannels.net.

helpforexpats.cz has the same mail server setup as other domains, including staysad.com, mail.designstudioone.com, davisplace.com, tractatus.org and achang.com.

Some mail servers are shared between helpforexpats.cz and other domains, for example benelli-moto.gr.

Host names with one IP number: The host name mx1.mailchannels.net points to 18.236.29.166 and the host name mx2.mailchannels.net points to 54.69.1.140.

helpforexpats.cz - robtex.com