`cortex-research.de`

DNSSEC	⚠️ Not signed
NS	`ns1.first-ns.de` ⭐
		A	2a01:4f8:0:a101::a:1^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
			PTR	`ns1.first-ns.de`
		A	213.239.242.238^{🇩🇪 Hetzner213.239.192.0/18 HETZNER-RZ-NBG-BLK2}
			PTR	`ns1.first-ns.de`
NS	`robotns2.second-ns.de`
		A	2a01:4f8:0:1::5ddc:2^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
			PTR	`robotns2.second-ns.de`
		A	213.133.100.103^{🇩🇪 Hetzner213.133.96.0/19 HETZNER-RZ-NBG-BLK1}
			PTR	`robotns2.second-ns.de`
NS	`robotns3.second-ns.com`
		A	2001:67c:192c::add:a3^{🇩🇪 NORIS-NETWORK2001:67c:192c::/48}
			PTR	`robotns3.second-ns.com`
		A	193.47.99.3^{🇩🇪 NORIS-NETWORK193.47.99.0/24}
			PTR	`robotns3.second-ns.com`
MX	`mail.cortex-research.de` ⭐
		A	136.243.217.222^{🇩🇪 Hetzner136.243.0.0/16 HETZNER-RZ-BLK-ERX3}
			PTR	`mail.cortex-media.de`
TXT	`v=spf1 mx -all`
SOA	`ns1.first-ns.de`dns@hetzner.com 2026-02-10 #0

`de`

	DNSSEC	🔒 Signed (DS record present)
	NS	`f.nic.de` ⭐
	NS	`a.nic.de`
	NS	`l.de.net` ⚠️ Not in parent delegation
	NS	`n.de.net` ⚠️ Not in parent delegation
	NS	`s.de.net` ⚠️ Not in parent delegation
	NS	`z.nic.de`
	SOA	`f.nic.de`dns-operations@denic.de serial=1776022569

Same first word

cortex-research.de

DNS History

4 records (4 active, 0 former)

●NSns1.first-ns.de2018-05-17 → 2026-04-12 · 2 obs

● 2018-05-17 19:03:34
● 2026-04-12 20:06:22

●NSrobotns2.second-ns.de2018-05-17 → 2026-04-12 · 2 obs

● 2018-05-17 19:03:34
● 2026-04-12 20:06:22

●NSrobotns3.second-ns.com2018-05-17 → 2026-04-12 · 2 obs

● 2018-05-17 19:03:34
● 2026-04-12 20:06:22

●MXmail.cortex-research.de2018-05-17 → 2026-04-12 · 2 obs

● 2018-05-17 19:03:34
● 2026-04-12 20:06:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, z.nic.de	-
cortex-research.de	ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com	-

✅ Authoritative Response

Server:213.239.242.238

NS records: ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cortex-research.de (unsigned zone)

⏱️ Timing

Total: 1284ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	3	`robotns3.second-ns.com, ns1.first-ns.de...`
MX	1	`mail.cortex-research.de (pri: 10)`
TXT	1	`v=spf1 mx -all`
SOA	1	`ns1.first-ns.de dns.hetzner.com`

Analysis

Name Servers

The delegation for cortex-research.de is handled by three name servers: robotns3.second-ns.com, ns1.first-ns.de and robotns2.second-ns.de.

cortex-research.de shares name servers with other domains at least partially, for example freiburgfestival.de, eurocoop.de, danielalm.de, cms9.biz and brwn.uk.

These name servers are commonly used with hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com and helium.ns.hetzner.de.

Host names with two IPs:

robotns3.second-ns.com points to 2001:67c:192c::add:a3 and 193.47.99.3

ns1.first-ns.de points to 2a01:4f8:0:a101::a:1 and 213.239.242.238

robotns2.second-ns.de points to 2a01:4f8:0:1::5ddc:2 and 213.133.100.103

Mail Servers

cortex-research.de is handled by a single mail server, mail.cortex-research.de.

mail.cortex-research.de points to a single IP: 136.243.217.222.

cortex-research.de - robtex.com