`mail.nextzone.cz`

CNAME	`nextzone.cz`
DNSSEC	🔒 Signed (DS record present)
A	185.25.184.238^{🇨🇿 MASTER-AS185.25.184.0/22 CZ-NETIO-20130508}
		PTR	`mail.nextzone.cz`
NS	`ns2.gransy.com` ⭐
		A	2001:19f0:6801:474:5400:1ff:fec5:8efb^{🇫🇷 AS-VULTR2001:19f0:6800::/38 Vultr Assigned Prefix}
		A	2001:19f0:7401:81e0:5400:1ff:fec5:8ef6^{🇬🇧 AS-VULTR2001:19f0:7400::/38 Vultr Assigned Prefix}
		A	95.179.192.121^{🇬🇧 AS-VULTR95.179.192.0/20 Vultr Assigned Prefix}
			PTR	`95.179.192.121.vultrusercontent.com`
		A	217.16.185.221^{🇨🇿 VSHOSTING217.16.176.0/20 III.}
			PTR	`ns2.gransy.com`
		A	217.69.4.49^{🇫🇷 AS-VULTR217.69.0.0/20 Vultr Assigned Prefix}
			PTR	`217.69.4.49.vultrusercontent.com`
NS	`ns.gransy.com`
		A	2001:19f0:5001:1caf:5400:1ff:fec5:8d50^{🇳🇱 AS-VULTR2001:19f0:5000::/38 Vultr Assigned Prefix}
		A	45.76.90.43^{🇩🇪 AS-VULTR45.76.80.0/20 Vultr Assigned Prefix}
			PTR	`45.76.90.43.vultrusercontent.com`
		A	77.78.104.149^{🇨🇿 CASABLANCA-AS77.78.96.0/20 Casablanca INT}
			PTR	`ns.gransy.com`
		A	95.179.136.180^{🇳🇱 AS-VULTR95.179.128.0/20 Vultr Assigned Prefix}
			PTR	`95.179.136.180.vultrusercontent.com`
NS	`ns3.gransy.com`
		A	2a02:750:7::2e7^{🇸🇪 GLESYS2a02:750::/29}
			PTR	`2a02-750-7--2e7-static.glesys.net`
		A	2a02:750:8::32^{🇳🇱 GLESYS2a02:750:8::/48 GleSYS AB}
			PTR	`2a02-750-8--32-static.glesys.net`
		A	46.21.100.103^{🇳🇱 GLESYS46.21.100.0/24 GleSYS AB}
			PTR	`46-21-100-103-static.glesys.net`
		A	77.78.126.35^{🇨🇿 CASABLANCA-AS77.78.124.0/22 Casablanca INT}
		A	109.74.7.71^{🇸🇪 GLESYS109.74.0.0/20}
			PTR	`109-74-7-71-static.glesys.net`
NS	`ns4.gransy.com`
		A	2001:19f0:5401:69b:5400:1ff:fec5:8f3f^{🇺🇸 AS-VULTR2001:19f0:5400::/38 Vultr Assigned Prefix}
		A	2a00:1a28:2010:1::89^{🇳🇴 GLESYS2a00:1a28::/32 Portlane Network}
			PTR	`2a00-1a28-2010-1--89-static.glesys.net`
		A	66.42.94.136^{🇺🇸 AS-VULTR66.42.80.0/20 Vultr Assigned Prefix}
			PTR	`66.42.94.136.vultrusercontent.com`
		A	80.67.7.209^{🇳🇴 GLESYS80.67.0.0/20 Glesys Network}
			PTR	`80-67-7-209-static.glesys.net`
NS	`ns5.gransy.com`
		A	2a02:750:5::538^{🇸🇪 GLESYS2a02:750::/29}
			PTR	`2a02-750-5--538-static.glesys.net`
		A	31.192.227.223^{🇸🇪 GLESYS31.192.224.0/21}
			PTR	`31-192-227-223-static.glesys.net`
MX	`mail.protonmail.ch` ⭐
		A	176.119.200.128^{🇨🇭 Proton176.119.200.0/24}
			PTR	`mail.protonmail.ch`
		A	185.70.42.128^{🇨🇭 Proton185.70.42.0/24}
			PTR	`mail.protonmail.ch`
		A	185.205.70.128^{🇫🇷 Proton185.205.70.0/24}
			PTR	`mail.protonmail.ch`
MX	`mailsec.protonmail.ch`⁽²⁰⁾
		A	176.119.200.129^{🇨🇭 Proton176.119.200.0/24}
			PTR	`mailsec.protonmail.ch`
		A	185.70.42.129^{🇨🇭 Proton185.70.42.0/24}
			PTR	`mailsec.protonmail.ch`
		A	185.205.70.129^{🇫🇷 Proton185.205.70.0/24}
			PTR	`mailsec.protonmail.ch`
TXT	`v=spf1 include:_spf.protonmail.ch mx ~all`
TXT	`MS=ms86881520`
TXT	`protonmail-verification=dc18f26cf0d53846fdc97ef33b69cd4112f3d785`
SOA	`ns.gransy.com`root@gransy.com serial=2781088171

`nextzone.cz`

	DNSSEC	🔒 Signed (DS record present)
	A	185.25.184.238^{🇨🇿 MASTER-AS185.25.184.0/22 CZ-NETIO-20130508}
	NS	`ns2.gransy.com` ⭐
	NS	`ns.gransy.com`
	NS	`ns3.gransy.com`
	NS	`ns4.gransy.com`
	NS	`ns5.gransy.com`
	MX	`mail.protonmail.ch` ⭐
	MX	`mailsec.protonmail.ch`⁽²⁰⁾
	TXT	`v=spf1 include:_spf.protonmail.ch mx ~all`
	TXT	`MS=ms86881520`
	TXT	`protonmail-verification=dc18f26cf0d53846fdc97ef33b69cd4112f3d785`
	SOA	`ns.gransy.com`root@gransy.com serial=2781088171

PTR for

238.184.25.185.in-addr.arpa

Same first word

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DNS History

1 record (1 active, 0 former)

●CNAMEnextzone.cz2026-04-07 → 2026-08-03 · 2 obs

● 2026-04-07 15:50:40
● 2026-08-03 03:50:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, d.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz	-
nextzone.cz	ns.gransy.com, ns2.gransy.com, ns3.gransy.com, ns4.gransy.com...	-

✅ Authoritative Response

Server:95.179.136.180

NS records: ns.gransy.com, ns2.gransy.com, ns3.gransy.com, ns4.gransy.com, ns5.gransy.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 2286ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`nextzone.cz`

Analysis

IP Addresses

mail.nextzone.cz resolves to just one IP address, 185.25.184.238.

Two other host names, along with www.energsystem.cz, petrbastl.com and nextzone.cz, also share IP numbers with mail.nextzone.cz.

Name Servers

mail.nextzone.cz delegates to five name servers: ns2.gransy.com, ns3.gransy.com, ns4.gransy.com and two others.

mail.nextzone.cz partially shares its NS delegation with several other domains, including fortemix.pl, procortex.cz, techsquat.com and two others.

These name servers regularly co-occur with the name servers ns.gransy.com, ns5.gransy.com and ns.gransy.cz.

Host names directing to five IP addresses:

ns2.gransy.com has four IP addresses — 95.179.192.121, 217.16.185.221, 217.69.4.49 and two others.

ns3.gransy.com has four IP addresses — 46.21.100.103, 77.78.126.35, 109.74.7.71 and two others.

Host names that resolve to four IP numbers:

ns4.gransy.com maps to the following IP addresses: 66.42.94.136, 80.67.7.209, 2001:19f0:5401:69b:5400:1ff:fec5:8f3f and 2a00:1a28:2010:1::89.

ns.gransy.com maps to the following IP addresses: 45.76.90.43, 77.78.104.149, 95.179.136.180 and 2001:19f0:5001:1caf:5400:1ff:fec5:8d50.

Host names that have two IP addresses:

ns5.gransy.com resolves to two addresses: 31.192.227.223 and 2a02:750:5::538.

Mail Servers

mail.nextzone.cz is served by two mail servers, mail.protonmail.ch and mailsec.protonmail.ch.

Among the domains sharing a mail server setup with mail.nextzone.cz are spa-factory.com, mesdup.com, einmalmitprofis.ch and two others.

There is at least a partial MX overlap between mail.nextzone.cz and other domains, including karstensommer.dk, dattus.de, ethex.market and two others.

mail.protonmail.ch has three IP addresses (176.119.200.128, 185.70.42.128 and 185.205.70.128) and mailsec.protonmail.ch has three IP addresses (176.119.200.129, 185.70.42.129 and 185.205.70.129).

mail.nextzone.cz - robtex.com

mail.nextzone.cz

nextzone.cz