linuxsystems.cz - dns.ninja

`linuxsystems.cz`

DNSSEC	🔒 Signed (DS record present)
A	18.157.65.185^{🇩🇪 Amazon18.156.0.0/14 EC2 FRA prefix}
		PTR	`ec2-18-157-65-185.eu-central-1.compute.amazonaws.com`
NS	`ns.forpsi.net` ⭐
		A	2001:15e8:101:1::c282^{🇨🇿 INTERNET-CZ2001:15e8::/32}
			PTR	`ns.forpsi.net`
		A	81.2.194.130^{🇨🇿 INTERNET-CZ81.2.192.0/18 INTERNET CZ, a.s.}
			PTR	`ns.forpsi.net`
NS	`ns.forpsi.cz`
		A	2001:15e8:201:1::d1b9^{🇨🇿 INTERNET-CZ2001:15e8::/32}
			PTR	`ns.forpsi.cz`
		A	81.2.209.185^{🇨🇿 INTERNET-CZ81.2.209.0/24}
			PTR	`ns.forpsi.cz`
NS	`ns.forpsi.it`
		A	2a00:6d41:2:1::5^{🇮🇹 ARUBA-ASN2a00:6d41::/32 Aruba S.p.A. IPv6 Network}
			PTR	`ns.forpsi.it`
		A	95.110.254.165^{🇮🇹 ARUBA-ASN95.110.192.0/18 Aruba S.p.A. Network}
			PTR	`host165-254-110-95.serverdedicati.aruba.it`
MX	`mbox.codeup.one` ⭐
		A	128.140.127.214^{🇩🇪 Hetzner128.140.0.0/17 HETZNER-DC}
			PTR	`mbox.codeup.one`
TXT	`v=spf1 mx a -all`
TXT	`google-site-verification=1hXBGXJcS9_0ZJqVNoVWkqpRPIyCXPvZSqIxHHurFpM`
SOA	`ns.forpsi.net`admin@forpsi.com 2026-08-02 #1

`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=1786479441

Subdomains

box.linuxsystems.cz

Same first word

DNS History

9 records (5 active, 4 former)

●NSns.forpsi.cz2015-07-06 → 2026-08-11 · 2 obs

● 2015-07-06 23:24:20
● 2026-08-11 20:49:44

●NSns.forpsi.it2015-07-06 → 2026-08-11 · 2 obs

● 2015-07-06 23:24:20
● 2026-08-11 20:49:44

●NSns.forpsi.net2015-07-06 → 2026-08-11 · 2 obs

● 2015-07-06 23:24:20
● 2026-08-11 20:49:44

○MXdbox.linuxsystems.cz2015-07-06 → 2017-01-09 · 4 obs

● 2015-07-06 23:24:20
● 2017-01-09 00:30:44
○ 2021-09-21 15:44:20
○ 2026-08-11 20:49:44

○MXmail-gw.linuxsystems.cloud2021-09-21 → 2021-09-21 · 4 obs

○ 2017-01-09 00:30:44
● 2021-09-21 15:44:20
○ 2026-03-26 03:23:14
○ 2026-08-11 20:49:44

●MXmbox.codeup.one2026-03-26 → 2026-08-11 · 3 obs

○ 2021-09-21 15:44:20
● 2026-03-26 03:23:14
● 2026-08-11 20:49:44

○A109.164.118.1572021-09-21 → 2021-09-21 · 4 obs

○ 2017-01-09 00:30:44
● 2021-09-21 15:44:20
○ 2026-03-26 03:23:14
○ 2026-08-11 20:49:44

○A178.33.105.1302015-07-06 → 2017-01-09 · 4 obs

● 2015-07-06 23:24:20
● 2017-01-09 00:30:44
○ 2021-09-21 15:44:20
○ 2026-08-11 20:49:44

●A18.157.65.1852026-03-26 → 2026-08-11 · 3 obs

○ 2021-09-21 15:44:20
● 2026-03-26 03:23:14
● 2026-08-11 20:49:44

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	b.ns.nic.cz, d.ns.nic.cz, a.ns.nic.cz, c.ns.nic.cz	-
linuxsystems.cz	ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net	2 records

✅ Authoritative Response

Server:95.110.254.165

NS records: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 1134ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`18.157.65.185`
NS	3	`ns.forpsi.cz, ns.forpsi.it...`
MX	1	`mbox.codeup.one (pri: 5)`
TXT	2	`v=spf1 mx a -all, google-site-verification=1hXBGXJcS9_0ZJq`
SOA	1	`ns.forpsi.net admin.forpsi.com`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.forpsi.cz, ns.forpsi.cz)

Analysis

Hierarchy

linuxsystems.cz is the parent zone for box.linuxsystems.cz.

IP Addresses

linuxsystems.cz resolves to one IP address: 18.157.65.185.

There are other host names — ec2-18-157-65-185.eu-central-1.compute.amazonaws.com among them — that share IP numbers with linuxsystems.cz.

Name Servers

DNS for linuxsystems.cz is handled by three authoritative name servers: ns.forpsi.cz, ns.forpsi.it and ns.forpsi.net.

linuxsystems.cz partially shares its NS delegation with several other domains, including bizi.cz, shl.cz, seak.pl and two others.

These name servers often co-occur with the name servers ns.forpsi.us.

Three hostnames — ns.forpsi.cz, ns.forpsi.it and ns.forpsi.net — each have two IP addresses: ns.forpsi.cz has 81.2.209.185 and 2001:15e8:201:1::d1b9, ns.forpsi.it has 95.110.254.165 and 2a00:6d41:2:1::5, and ns.forpsi.net has 81.2.194.130 and 2001:15e8:101:1::c282.

Mail Servers

Mail for linuxsystems.cz is handled by a single mail server, mbox.codeup.one.

The mail server configuration of linuxsystems.cz is identical to that of other domains — codeup.one being one example.

mbox.codeup.one has exactly one IP number: 128.140.127.214.