`estersafranek.cz`

DNSSEC	🔒 Signed (DS record present)
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	`mx1.mailchannels.net` ⭐
		A	54.187.177.89^{🇺🇸 Amazon54.186.0.0/15 EC2 PDX prefix}
			PTR	`ec2-54-187-177-89.us-west-2.compute.amazonaws.com`
MX	`mx2.mailchannels.net` ⭐
		A	54.187.177.89^{🇺🇸 Amazon54.186.0.0/15 EC2 PDX prefix}
			PTR	`ec2-54-187-177-89.us-west-2.compute.amazonaws.com`
SOA	`ns.web4u.cz`admin@web4u.cz 2025-05-06 #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=1778462235

Same first word

estersafranek.cz

DNS History

14 records (6 active, 8 former)

●NSns.web4u.cz2026-05-11 → 2026-05-11 · 2 obs

○ 2018-05-06 15:25:36
● 2026-05-11 01:58:10

○NSns.wedos.com2018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

○NSns.wedos.cz2018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

○NSns.wedos.eu2018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

○NSns.wedos.net2018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

●NSns2.web4u.cz2026-05-11 → 2026-05-11 · 2 obs

○ 2018-05-06 15:25:36
● 2026-05-11 01:58:10

○MXlinode-miomx1.mioweb.cz2018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

○MXlinode-miomx2.mioweb.cz2018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

●MXmx1.mailchannels.net2026-05-11 → 2026-05-11 · 2 obs

○ 2018-05-06 15:25:36
● 2026-05-11 01:58:10

●MXmx2.mailchannels.net2026-05-11 → 2026-05-11 · 2 obs

○ 2018-05-06 15:25:36
● 2026-05-11 01:58:10

●A2001:1568::142026-05-11 → 2026-05-11 · 2 obs

○ 2018-05-06 15:25:36
● 2026-05-11 01:58:10

○A2a01:7e00::f03c:91ff:fe84:7f442018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

●A81.91.86.142026-05-11 → 2026-05-11 · 2 obs

○ 2018-05-06 15:25:36
● 2026-05-11 01:58:10

○A88.80.191.1192018-05-06 → 2018-05-06 · 2 obs

● 2018-05-06 15:25:36
○ 2026-05-11 01:58:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz	-
estersafranek.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: 1072ms | 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	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

estersafranek.cz points to two IP numbers: 2001:1568::14 and 81.91.86.14.

Other host names such as revisol.cz, czechcoins.eu, www.proturbo.cz, noco.cz and mindsetacademy.org share IPs with estersafranek.cz.

Name Servers

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

estersafranek.cz shares the same name server setup as other domains, for example crystalvalley.cz, tipsport.si, (0x636f636b)ykontaktni.cz, baleno.cz and webreality.eu.

estersafranek.cz partially shares name servers with other domains, for example elcad.cz and varicad.com.

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

Two mail servers handle estersafranek.cz: mx1.mailchannels.net and mx2.mailchannels.net.

estersafranek.cz shares the same mail server setup as other domains, including mail.cbrsanbernardo.cl, tumbleseed.com, gdpsupergroup.com, hanapepe.org and pereuro.com.

estersafranek.cz shares at least some mail servers with other domains, for example lafayettesigns.com and gdamicro.com.

Host names with a single IP:

mx1.mailchannels.net points to 54.187.177.89.

mx2.mailchannels.net points to 54.187.177.89.

Host names pointing to 54.187.177.89: mx1.mailchannels.net and mx2.mailchannels.net.

estersafranek.cz - robtex.com