`mailadmin.good.cz`

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

`good.cz`

	DNSSEC	🔒 Signed (DS record present)
	A	2001:1568::14^{🇨🇿 WEB4U2001:1568::/33}
	A	81.91.86.14^{🇨🇿 WEB4U81.91.80.0/21}
	NS	`ns2.web4u.cz` ⭐
	NS	`ns.web4u.cz`
	MX	`good-cz.mail.protection.outlook.com` ⭐
	TXT	`v=spf1 include:spf.protection.outlook.com -all`
	SOA	`ns.web4u.cz`admin@web4u.cz 2006-09-16 #1

Same first word

Similar names

DNS History

3 records (2 active, 1 former)

●A2001:1568::142026-06-13 → 2026-08-07 · 3 obs

○ 2016-11-06 06:57:26
● 2026-06-13 10:16:50
● 2026-08-07 00:43:52

●A81.91.86.142026-06-13 → 2026-08-07 · 3 obs

○ 2016-11-06 06:57:26
● 2026-06-13 10:16:50
● 2026-08-07 00:43:52

○A81.91.87.102015-07-08 → 2016-11-06 · 4 obs

● 2015-07-08 14:25:24
● 2016-11-06 06:57:26
○ 2026-06-13 10:16:50
○ 2026-08-07 00:43:52

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
good.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: 1004ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.91.86.14`
AAAA	1	`2001:1568::14`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)

Analysis

IP Addresses

mailadmin.good.cz directs to two IP numbers, 81.91.86.14 and 2001:1568::14

Among the host names that share IP numbers with mailadmin.good.cz are valderance.cz, zpa.cz, mx-1.mcare.cz and two others.

mailadmin.good.cz - robtex.com