`mysql.supervisor.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}

`supervisor.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	`mx1.mailchannels.net` ⭐
	MX	`mx2.mailchannels.net` ⭐
	SOA	`ns.web4u.cz`admin@web4u.cz 2025-05-09 #0

WOT: SAFE (50/100)
WOT: SAFE (42/100)

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DNS History

2 records (2 active, 0 former)

●A2001:1568::142026-04-20 → 2026-08-13 · 2 obs

● 2026-04-20 21:30:40
● 2026-08-13 17:41:10

●A81.91.86.142026-04-20 → 2026-08-13 · 2 obs

● 2026-04-20 21:30:40
● 2026-08-13 17:41:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz	-
supervisor.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: 886ms | 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, ns2.web4u.cz, ns.web4u.cz...)

Analysis

IP Addresses

mysql.supervisor.cz points to the IP addresses 81.91.86.14 and 2001:1568::14

partsboilers.com, mail.kolkovna-group.cz, doo4you.eu and two other host names share IP numbers with mysql.supervisor.cz.

mysql.supervisor.cz - robtex.com